When you activate some utilities like LaunchBar and MsgFiler from a full screen application it causes you to flip back to a Desktop. You can avoid this if the app allows you to disable the Application Icon in the Dock.
For both of the third party applications LaunchBar and MsgFiler, go to the application's preferences setting and disable the Dock Icon so that the application runs as a background application. Now switching to or activating the utility won't switch you back to a Desktop and leaves you in your full screen app.
If you have a utility that allows it to run in background and you run into this screen flip-flop problem, you can try setting it to background (no icon dock) mode and see if that helps.
If the utility/app doesn't have this option, MAYBE this very old hint will help to force some arbitrary app to run in background.
Lion adds a little known feature in iCal, birthdays without birth year.
I've had a rather large Address Book contact list that over the years have been synced by multiple services and some of the birthdays show a wrong year. This hint shows how you can do a quick(er) clean up of your birthdays calendar.
Users of Filemaker's Bento know that beyond being a practical personal database it is also an awesome quick editor for Address Book. In Bento, all of your Address Book fields can be shown in a database/spreadsheet format and you can quickly filter and order your contacts based on the field.
Launch Bento (even the trial version will work), lookup Address Book and enable the 'Birthday' field.
The hint here is that all of the Birthdays without a year in iCal are actually dated the year '1604.' So browse at your leisure and by selecting the 'Birthdays' column you will be able to see the ones which show a wrong year and change it to '1604.'
As a result your updated Birthdays will show no years in iCal.
There might be other, more elaborate, ways to do this but at least this could be done without fiddling with the system using Terminal or going through each contact one by one in Address Book.
If Java won't run under Lion for you, a solution to this 'problem' may be as simple as enabling a Java VM. By default, Java is disabled (and probably not even installed) in 10.7.
Try the following:
Go to Applications » Utilities and open the Java Preferences.app.
Make sure the checkbox at the top is 'checked' in order to enable Java in Lion. If Java is not already installed, you may be asked to do so first.
[crarko adds: When I did this I was asked to download the Java VM using Software Update. It appears to have become an optional install, like Rosetta was with Snow Leopard. It also looked like this was still the Apple Java VM, and not an Oracle-produced version, although I can't say so for certain.]
Are you reinstalling Outlook 2011 and want to reuse your existing rules? I had too many mail rules to type in again and thought there would be a better way.
I had performed a clean install of Lion and then reinstalled MS Office 2011. There was no way to export/import the existing rules I had created in the Snow Leopard install of Outlook 2011. I tried copying the rules to the correct directory within Lion with the faint hope that the new install of Outlook would recognize them, but that didn't work.
What did work was this. After copying the existing rules to the new Lion install I ran the Rebuild Database Utility in Outlook. The rules were processed and added to the list.
There were minor errors related to categories but that was because I hadn't created the corresponding categories in the new install. This was much faster and more accurate than retyping all of them.
[crarko adds: If you find yourself in a similar situation, give this a try.]
Admittedly, this may be more of an observation than hint. On most full screen apps I use (Reeder for Mac, Mail, the fugly iCal) you don't typically need another window.
I have always had Safari to open new windows as tabs. I think this may now be the default in full screen mode. If you want another full screen invocation of Safari, just hit Command+N.
By extension: each Safari window with its own set of tabs can independently be in full screen mode or not.
[crarko adds: This doesn't actually run a second copy of Safari, it just creates a new Space and puts the new full screen window in it. It looks like Preview does something similar when you open multiple documents while running full screen.]
You can take screenshots with keyboard shortcuts, the Grab application, or third-party applications. The Lion version of Preview takes screenshots now, too.
In Preview, select File » Take Screenshot, and select from the three options: From Selection; From Window; or From Entire Screen.
When you select your menu item, an overlay appears reminding you what to do next. You can use the Application Switcher (Cmd+Tab), Mission Control, or left-right trackpad swiping to get to the desired desktop and application. Then select the desired screen area or window and click to take your screenshot. You can't take a screenshot of menus this way because you have to click to bring up a menu. (For that, select the desired menu/submenu and use the good, old Cmd+Shift+4 » Space bar keyboard shortcut.)
OK, so why go to all this trouble when I can just use Cmd+Shift+3 or Cmd+Shift+4 to do the exact same thing with a lot less trouble? Well, frankly, most of the time you wouldn't. But Preview has some nifty tricks up its sleeve that it's inherited from the venerable Grab application.
Selecting the From Entire Screen option gives you a 10 second countdown so you can get things just the way you want, which with Mission Control and Spaces is easier than ever because you can setup one desktop for your screenshot and open Preview in another. You have time to position the cursor where you want it, too.
After you take the screenshot, instead of dropping a new file on to your desktop, the new image opens right up in Preview where you can edit it as desired, including cropping out undesired parts and adding annotations. Click the Close button (or the Save... or Export... menu item) and you can choose from one of six different image formats, including JPEG, PDF, or even OpenEXR. You can name it and save it wherever you want, and there's Versions and Full Screen support, too. (Full screen screenshot pranks, anyone?)
Longtime users of Grab will likely say, 'So what?; But Preview has incorporated Grab's features and brought them nicely forward with support for the latest APIs and UI features. You've heard of Grab, right?
A little history: A hold over from NeXSTEP/OpenStep, Grab is an odd little app that's been around since the very first version of Mac OS X. Grap.app lives on in Lion; version 1.6 (build 109) copyright 1995-2011 is in your Utilities folder.
[crarko adds: Grab was always one of those programs I saw people having difficulty understanding how to use. It was kind of a strange process, not unlike taking a screenshot in Windows. This way seems to be far more intuitive.
*Changed from a 10.7-only hint as people have noted this is also present in earlier versions.*]
There was once a hint that worked for previous versions of Mail about three-fingered scrolling to flip through messages.
With Lion, the three-fingered flip now launches Mission Control, so navigating through Mail messages has changed to a FOUR-fingered flip. It took me a while to figure it out on the Magic Trackpad -- it seems to call for a little practice.
A flip Up/Left brings you to the next message up the list; a flip Down/Right brings you to the next message down.
[crarko adds: This is starting to take on the feel of learning to play a new musical instrument, which is not all bad, and possibly intentional on Apple's part.]
Mail's 'Include related messages' preference shows sent messages together with received in the preview pane, however it fails to show them in the message list. It also doesn't send them to the trash when deleting a thread.
I replaced Inbox in my favorites bar in Mail with Conversations, which is a smart mailbox containing all messages that are in Inbox or in Sent. Now, not only do I see related messages on the right, if I open a thread on the left, they're all there, too. Plus, when I'm done with a thread and I choose to delete it, all the related messages also get deleted, instead of sticking around in my Sent mailbox.
It's not immediately obvious that more options exist due to the new scroll bar display.
Open Dictionary (it lives in /Applications in case you didn't know) and select Dictionary » Preferences. Scroll down the list of options and enable the two British options. Then click on them and drag them to the top so they take precedence.
You can leave the two existing American options enabled for the odd occasions that they might be useful. This tip pre-supposes, naturally, that British English is a better choice for you than the US dialect.
The other options previously available in Snow Leopard appear to remain largely unchanged. (The New Oxford American Dictionary has been upgraded from the 2nd edition to 3rd.)
[crarko adds: Nice to have the new options for our friends across the Pond.]