If you use the Twitter client/service TweetDeck, you should log out and log back in to block a security vulnerability that quickly spiraled out of control last week, resulting in a torrent of out-of-control retweets. Twitter took TweetDeck offline until the bug could be fixed, but all should be well now. follow link
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Use Shift to Compare Edits in iPhoto '08
In iPhoto '08, while you're editing a photo, press the Shift key to see a "before" view; let it up to see the "after" view. It's much faster and easier than using Undo and Redo.
All Hands off TweetDeck