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Using X11 in Mountain Lion System 10.8
Mac OS X 10.8 no longer includes X-11 as an option. If you need to run software that requires X-11, you have to install XQuartz 2.7.2 or later.

You can download XQuartz 2.7.2 at

[kirkmc adds: I haven't tested this. I haven't needed X11 for donkeys' years.]
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How to disable the iCloud Open dialog in Mountain Lion System 10.8
Mountain Lion introduced a new Open dialog to reflect iOS behavior. This dialog appears in TextEdit and Preview when you launch them, and you can't disable it in the applications' preferences.

The only way to disable the iCloud open dialog is to uncheck Documents & Data in the iCloud pane of System Preferences. This also disables the default iCloud destination in Save dialogs.
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Quick Look an inline graphic in Messages System 10.8
Previously, if you had the iChat File transfers window open, you could click on an inline graphic that someone sent you in a chat and press the space bar to view it in Quick Look. In Mountain Lion, this no longer works. You can, however, click on the graphic in the Messages window, then press the space bar to view the image in Quick Look.
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Quickly rename bookmarks in Safari's Bookmarks Bar System 10.8
You no longer need to right-click and display a dialog to be able to edit the name of a bookmark in Safari' 6's Bookmarks Bar. Just click and hold the bookmark; the name will become highlighted and you will be able to rename it in the Bookmarks Bar.

As a commenter pointed out, this is a feature of Safari 6. I edited the hint before Safari 6 was released, so wasn't aware that this would be the case.
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Use Safari extension to replace missing RSS button System 10.8
In Lion Safari, you'd see an RSS button whenever you landed on a web site that had an RSS feed. This was a great way to quickly subscribe to that feed: just click the button and your newsreader would open and you could add the feed as a subscription.

Safari in Mountain Lion does not have that button, but developer Daniel Jalkut of Red Sweater Software has created a Subscribe to Feed Safari Extension. As Jalkut describes it, this extension "adds a handy button to the toolbar that, when a page offers RSS or Atom feeds, can be clicked to easily open the feed:// link, which should automatically open your favorite news reader."

Jalkut says that it's a beta, but it seems to work just fine in my tests.
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Temporarily hide Alerts and notifications from Notification Center System 10.8
You can easily pause the Notification Center in one click. Press the Option key while clicking on the Notification icon in the right end of the menu bar. This will pause the display of notifications until the next day. To reactivate Notification Center, you can Option-click the same icon again, or you can display notifications at the right of the screen by clicking on the Notification Center icon, then toggle the Show Alerts and Banners switch from Off to On.
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Remove icons from the Dock in Mountain Lion System 10.8
Before OS X Mountain Lion, you could drag an icon out of the dock and and it would disappear when you let go of it. This also used to work with the Finder's sidebar entries, but Apple has removed both of these in Mountain Lion.

With Mountain Lion's Finder sidebar, you have to right-click an entry and choose Remove from Sidebar from the contextual menu.

It might appear that this is now the only way of removing icons from Mountain Lion's dock, too. But I discovered that if you drag an icon out of the dock, then hold it anywhere for a second, the first frame of the "poof" animation appears next to the cursor. When you release the mouse button, the icon will disappear.

This is a nice touch to prevent users from accidentally removing icons from the dock.

[kirkmc adds: This irked me when I finally installed the Mountain Lion GM on my main Mac. I didn't come across this drag-and-hold-a-second thing, and it's good to know. The Finder sidebar bit is annoying, and maybe the same trick will eventually work there.]
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Keyboard shortcuts for outgoing e-mail accounts work again in Mountain Lion System 10.8
This is definitely hint-worthy. One of the really great features that I missed in Lion is back in Mountain Lion. Originally described in this hint, you can set keyboard shortcuts for outgoing e-mail accounts.

Go to the Keyboard pane of System Preferences, then click on Application Shortcuts. Click on the + icon, and choose Mail from the Application menu. Then, enter the exact name of your account as it appears in the From popup menu when you create a new message. It will look like this:
First_name Last_name <my_email@my_host>
Make sure to include the angle brackets, and put a space before the first one. Choose a shortcut -- I chose Command-Option-Control and a letter for each account -- then click Add.

To use this, create a new message in Mail. If the default account isn't the one you want, just press your shortcut to set the message to go from a different account. You can set shortcuts for all you accounts, or merely one or two, if you have a lot.
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