I know everyone has seen galleries of Vista before, but this is one of the best that I have seen. There are a ton of screenshots and they are broken up into categories so that it is easier to see what you are looking at. They also walk you through a lot of the screenshots so that you know exactly what is going on.
I have been using Vista for a little over a week and I have to say that they have done a great job of covering a lot of the cool features. If you are wondering what Vista Beta 2 is all about then you will find this article very useful.