I played with slackware, SLAX, Mandriva 10 and Fedora Core 5, so far I'm liking fc 5 the most. I have it only in a virtual PC though, don't wanna install the whole thing until I'm more familiar. Eventually I'll get it though
I have the Vista RC2 installed on another partition right now, I'll be playing with that until they send me a fully licensed DVD then install that, but I won't completely switch until much more compatibility.
Go Vista Ultimate, my 'puter rules.