Don't worry, by the time they finish "upgrading" XP, Vista 7 will be teh fastest. Do you really think upgrades are going to be kind to the OS they have tried to kill for the last two years? Move to free software before your systems all crap out and you will be happier.
This has been going on forever, but Vista's failure ends it. You're talking to a guy who fell for the Win98 trick but not the XP trick. Every OS upgrade from M$ since 95 has been a bigger joke than the last. They beat better stuff from IBM and Apple with OEM and retail strong arming, but Vista is putting them all out of business.