If you get a new computer with Vista, make sure you keep your old one with XP as a lot of stuff is not yet compatable eg. need XP to update the operating system on my mobile phone.
If you have Vista check carefully before buying any hardware, my choice of an all in one Printer/Scanner/Fax was limited.
XP is much more stable and I have found no real advantage with Vista so far, had quite a few Ctrl/Alt/Dels. Maybe my 1gig RAM isn't enough