After installing Beta 2 of Microsoft's upcoming operating system, I decided to grab a few videos of the GUI in action. As can be seen by the following videos, Microsoft shows off Windows Vista's graphics engine. Notice how hovering over the minimized windows in the taskbar will bring up a thumbnail view of the window.

There appears to be slight irregularities in the versioning info of this article.
The version in question is PDC - not beta2 as the article says - thanks Yakumo