For those of you that can't afford TopDesk but still craving for Flip-3D like effects on your XP machine, here's a program that's FREE, consumes little resources and handles the job pretty well: Madotate 2.02. It supposed to be a Japanese program but a proper English translation is included inside the zip file.
Hope you guys enjoy it.

Screenshot,
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*Credits to TechII from DevianArt for the screenshot.

Get it here! [attachmentid=207960]