agree, i'm running the RC beta of Vista on one of my backup trading PC's and its both fast & sweet looking.
Stable, no crash issues at all in the 3 months I've been using it. I also like 64bit IE7 very much too.
You need a decent spec PC to run it efficiently though, as it does carry a reasonable memory overhead compared with XP.
I'm running it on a dual xeon 3.6ghz 2GB and have no complaints at all. Vista is fast to load, very fast to run.