I like vista home premium on my new machine. Other than just after install windows update trashing a driver, its been completely stable. I bought all new parts to build a new vista machine.
I really like media center(included in home premium), hadn't gotten to play with that before since i only had XP Pro, and not XP MCE.
I don't have anything bad to say about vista, i've had it installed since ~august last year.
The hauppauge vista driver support for a HD tuner i have from them is craptastic. Every other game or app i've tried to install works perfectly though.
Vista home premium 32bit, Intel dp35dp, E6850, 4gb ram, 8800GTS640, WD Raptor + WD 1TB, DVICO Fusion5 Gold ATSC Tuner.