This is a very good user application made for Windows Vista,
i found on neowin
Presenting Smartflip, a solid replacement for Flip3D on Windows Vista. Flip3D presents the windows on screen in the form of Angled Windows & the winkey +tab combination cycles them
SmartFlip shows the windos in a circular way, like shown in the screenshot. Try it, it's a standalone application
Right now, it's slow, & i mean slow. The code is under developement, & it's made using WPF, however those thumbnails are 2D drawings right now. They will be 3d soon

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woops, wrong section. Mods plz change to software reviews