I just got back into this game as well. My warlock was lvl 20 from sometime around '04 and man you're in for quite a few changes. I got him up to 51 last night and have been toying around with a ranger and a warden as well. I'm personally trying to find a good partner class for my warlock so I can dual box and at least be able to grind xp/aa with ease. I think at this point I'm considering a fury or defiler.. I need to read up some more though.