I have Photoshop 6 and Painter X, but not CS2.
Although I'm in with a group of people here near where I live, where we've been getting together and working on some mods for Half Life 2. The guy who's in charge of that project has CS3 and I've been using it when I go over there. Although I have to say I've never really learned any of the finer points of all Photoshop can do, which is why I haven't upgraded.