If you can’t leave Windows XP but love some of the new features of Vista specially the thumbnail preview, then here is the chance to get it without upgrading your XP to Vista or installing a Vista transformation pack.
I present to you Visual Tooltip. Visual Tooltip allows you have the thumbnail preview feature of Vista and also to switch between multiple desktop applications using a graphic interface. You can also create a dock where you can easily place all your favorite and most used application shortcuts. What I also love about visual tooltip is that it lets you hide your XP taskbar to make it look like a Mac OS.