Wulfhunter originally posted this link. You may want to read it as it really dispells a lot of "urban legend" and predjudices against Vista that even I didn't know.
http://www.tweakguides.com/VA_1.html
Read the entire article as it is quite illuminating as to the false pretenses many folks have about the OS. And it looks like folks that hold on to XP until Windows 7 comes out are going to be in the same position I was in when I waited until XP got sorted out before dumping Windows 98se. And once I did switch, it took the better part of a month to get used to XP as it was completely different from what I was used to.
So I would suggest from the article to upgrade, and then when Windows 7 gets sorted out, the transition won't be so difficult. It's the wise thing to do, but I have done my share of unwise things in the past.