I'm a bit skeptical to run Win7 atm. Not to mention most offices and businesses still run XP to date. It's them that MS has to woo with immediate effect, we are already fans of Win7 (atleast I like it)
I did run the RC and beta versions of Win7 and found it much better than Vista anyday, in terms of responsiveness and stability.
With XP though, I doubt whether booting a few seconds faster will make any difference.
I prefer XP even now (mainly because I dont have money to upgrade to a bigger HDD and back-up), but given the chance (and money) I'll go ahead for win7.
For now (or atleast a few months) it's a pass for me.
Are there any application compatibilty issue? even if there are, is Virtual XP mode capable of handling it?