One of prettiest useless things seen I've seen in awhile: the Twingly screensaver, via Biz Stone. Pulls in blog RSS feeds from all over the world, showing them accumulate in pillars on an elegantly rotating 3D globe. Post titles scroll by; click on any title to display the post and have the globe flip to the blog's physical location. And of course you can zoom and rotate around the blog-globe like the crazy spaceman you are. Minutes of fun.

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