i tried the latest RC a few weeks ago and it nuked my windows install. so i'm waiting on the final to be released. then waiting another week or two after that.
kinda off topic, but when sp2 first came out. my local circiut city had the sp2 update disks for free on display. i still have that disk, saves time on installs when i'm using my old xp pro disk. i hope they do the same with sp3, offer it on disk free.