I would wait as has been said. It is never good to get anything from Microsoft out of the gate. If you have two drives (or two partitions on one drive) and a little cash, I highly recommend getting Norton Ghost and doing a drive image backup before updating. This way should XP SP2 really create havoc, you can use that image to restore back to where you were. Trust me, it saved my butt when I updated to win2K SP4 that played complete havoc with my machine. It's worth the money to save all the chaos. Otherwise Sharen is correct. There is no uninstall for a service pack, so if you don't have it backed up, you can't uninstall it. Also copying everything on C does not work. It has to be imaged to be able to be restored correctly.

Just some hints, but as the above says, unless you are having serious issues now with security, I'd just hang tight.

ShadowWind