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10.6: Java 1.6 works on all Intel Macs in Snow Leopard System 10.6
One problem with using an Intel Core Duo Mac is the inability to use JRE 1.6. The JRE 1.6 update was limited to 64-bit chips only, which really ticked me off. After upgrading to Snow Leopard, a friend mentioned to me to check my Java version. Low and behold, java -version in Terminal reported back 1.6.

Running the Java Preferences application in the Utilities folder clearly states to me that it is a 32-bit build, so there was no reason for us early adopters not to have JRE 1.6 in the first place. So if you need JRE 1.6 and were an early adopter, then you need to pony up for Snow Leopard to get the update. I can confirm that Java apps that didn't work in Leopard now work, as I now have a current build of JRE.
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10.6: Select windows by name in Exposť System 10.6
With Exposť's 'all windows' view active, start typing the name of a window to highlight it. Type as much of the name as you like (including spaces and periods) for the desired window. For instance, typing untitled 4 will get you that window instead of untitled 3, etc. Type quickly, though!

After the proper window is highlighted, press Return to make it active and exit Exposť.

While testing this, I once noticed that Exposť didn't register the change of name of a window -- it still registered as Untitled, even though I could see the correct name in the toolbar.
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10.6: Sleep and lock display with hot corner System 10.6
In previous versions of OS X, hot corners would not lock the screen when invoking display sleep, even if the security settings specified it.

The closest thing you could do was to use a screen saver like BlackenedPixels. This, however, was not always reliable for turning off the backlight. Snow Leopard appears to fix this behavior, as it really puts the display to sleep and locks it when you have a hot corner set to activate display sleep.
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10.6: Exclude words from spelling auto-correction System 10.6
Should you have a word that you do not want the system to auto-correct (omg is changed to omega, for example), but do not want to permanently add it to the dictionary because it's not a real word, here's a workaround.

In the Language & Text System Preferences panel, click on the Text Substitutions tab, and then put the non-word in both the Replace and With columns. That way, when you type that non-word, it is replaced with itself, and the spelling auto-correction never takes place!
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10.6: See Dock contextual menus without application entries System 10.6
Normally when you Control-click on an item in the Dock, you'll see a contextual menu with that program's Dock commands, along with the OS X system commands (Hide/Show, Quit, and Options). In 10.6, there's now a keyboard shortcut to see just the OS X system commands: hold down Command and Control, then click on an application's Dock icon.

This may not be all that helpful, but it does make closing System Preferences somewhat quicker and cleaner looking, as you don't see all the individual panels in the contextual menu.

[robg adds: If you add in the Option key while holding Command and Control with the contextual menu visible, Quit will change into Force Quit, just as though you had pressed Control-Option before clicking to get the "full" contextual menu.]
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10.6: Show country flag on Input Menu on menu bar System 10.6
I keep the Inputs menu in my menu bar primarily for the Keyboard and Character Viewer functionality. Upon installing Snow Leopard, I saw that the icon for the inputs menu (System Preferences » Language & Text » Input Sources » Show Input Menu in Menu Bar) had changed from a nice colorful American flag (my default input method is U.S.) to a black and white (and ugly) Keyboard & Character Viewer icon.

After a little investigating, it seems that once you select a secondary input method (I chose Australian), the flag icon comes back! The secondary flag shows up when you click on the menu bar item, but you don't need it.

Incidentally, the 'Unicode Hex Input' input method is pretty cool if you want to enter Unicode characters manually (although I find it easier to search for the character I'm looking for in the Character Viewer, and then insert it from there).
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10.6: How much of Snow Leopard isn't yet 64-bit? System 10.6
Run the following command in Terminal to see exactly how many of OS X's extensions are 64-bit and how many are still 32-bit:
file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -i x86_64 |nl |tail -1 |cut -f1 -f3 && file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -v x86_64 |nl |tail -1 |cut -f1 -f3
[robg adds: This command will take a few seconds to run. On my MacBook Pro, there are 129 64-bit extensions and 325 32-bit extensions.]
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10.6: Create per-device settings for cameras and iPods System 10.6
Have you ever had the conundrum where you would like iPhoto to open automatically for your camera, but not for your iPod touch or iPhone?

Have a look at the new Image Capture app in Snow Leopard -- it now allows setting custom per-device actions. No more need for AppleScript workarounds!
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10.6: Make List view Stacks work like Grid view Stacks System 10.6
There's a new hidden preference available for List view Stacks in the Dock in 10.6. Open Terminal and run these two commands:
$ defaults write use-new-list-stack -bool YES
$ killall Dock
This will make the List view behave like the Grid view, only with all items arranged in one vertical list, with names to the right.

[robg adds: The screenshot at the right is mine; click it for a larger version of the before (left) and after (right) versions of the List stack. With the change, you'll have to drill down into folders as you do with Grid view stacks; this hint's keyboard method works fine for the new style List view stacks.]
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10.6: Enable 10.5-style mouseover highlights in Stacks System 10.6
Thanks to this hint (and its original version, appearing as a link to the author's blog in this comment) about using gdb to find hidden preferences, I have discovered that it's still possible to enable automatic mouseover highlighting in stacks as you could in 10.5 (original hint).

It turns out that the name of the preference key has changed from mouse-over-hilte-stack to mouse-over-hilite-stack. So to enable mouseover highlighting of Stacks, open Terminal and run these two commands:
$ defaults write mouse-over-hilite-stack -boolean yes
$ killall Dock
After that, your Dock's stack items will highlight as soon as you move the mouse over them.

[robg adds: I ran this as a separate hint from the recent Use mouse-over-highlight in 10.6's Stacks as it's been a very popular email request in my inbox, and it struck me that it was worth a standalone entry as the first use of gdb to find a hidden pref in 10.6. Note that it also works in Fan Stacks mode, which wasn't true in 10.5.]
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