In OS X Lion the thumbnail previews of windows from the same app are grouped together. By hovering the mouse over these thumbnails and scrolling up, you can expand the group of windows. It is possible to display these windows in full size.
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Activate element inspector in the Mac App store
In the Mac App Store is a hidden element inspector available that lets you view the source of any page or element. It is possible to extract text or images, and adding your own code through the console option.
iTunes: Enable half star ratings
iTunes allows users to rate songs from 1 to 5 stars. For more precise ratings, enable the half-star rating option in iTunes. Very useful when a song is not quite worth 4 stars but not 5 stars either. Close iTunes and use the following defaults write command:
Display full posix path in OS X Finder title Bar
When browsing into the Finder folders, you may lose your current path. You can enable the path view (like View ▸ Show Pathbar) in the title bar of the Finder window. The command show the complete posix path in the title bar.
Disable OS X crash report dialog window
When an application in Mac OS X decides to unexpectedly quit, a crash report dialog with additional crash information will appear on the screen. You can disable this crash report dialog with:
OS X Mail: Display e-mails in plain text format
If you have problems with HTML emails received in OS X Mail, you can force the Mail app to display e-mails in plain text using the following defaults write command.
Disable CD/DVD media burning in OS X Finder
You can prevent users from burning CD/DVD media on your Mac. Enabling this command will result in the following message when trying to burn a CD or DVD: “The operation can’t be completed because you don’t have the necessary permission”.