my day job is manager of information systems
go with xp
given 2 computers with the exact same hardware one with vista, one with xp - the vista computer will run ~50% slower than xp.
shortly xp will have sp3 which will give xp an additional 10% performance boost.
at my company, we will not be spending more money for better hardware to run the same jobs ... slower, simply for the "privilege" of running vista.
vista is the new windows me (Millennium Edition)
dell, hp, lenovo, etc have all begun offering the option to "downgrade" to xp.
sorry guys, just because it is newer, doesn't make it better. if you want windows, stay with xp, if you want cool go with a mac.
there is no compelling reason to switch to vista. i don't care one way or the other about mac, windows or linux - as far as i'm concerned all three are nothing more than hammers to me - just a tool for doing my job. sometimes one feels better than the other for doing a particular job ... but ultimately, they're just tools.