The 0.33.2 release of Iain Dodsworth's Adobe AIR-based Twitter client, TweetDeck, comes on the heels of a more substantial update. Changes first introduced in version 0.33 include an increased API call limit, a new Column Navigator, and support for media previews within TweetDeck of content from YouTube, Posterous, Flickr, Mobypicture and Twitgoo. The update also enables you to make changes to your search columns (rather than having to delete and recreate them), adds a new Help section that improves support and troubleshooting features, and addresses a long list of minor issues. Versions 0.33.1 and 0.33.2 each fix a few small bugs. (Free, 2 MB)
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Multi-Monitor iChat in Snow Leopard
In Snow Leopard, on a multiple-monitor system where you're using screen sharing over iChat, dragging the tiny inset preview of your own screen to another monitor shifts the remote screen to that monitor.