If you want to know what it is like, but don't want to download and install one of the RC versions, here is an article that I think does a good job of presenting just what you will see when you fire up Vista.
I mentioned some of this on the show yesterday, but one thing I didn't get to mention is the animation. After reading this article I understand the rationale, but after a few hours of zipping, zooming, and flying animated windows I was getting seasick. Same thing goes for the "circle" hour glass. It leaves my head spinning. The good news is just like previous versions of Windows, these things can be customized or turned off. I'm much happier without Vista's animated windows. I guess I kind of know where they are going without a visual cue to aid me.