I haven't played in several years, but I used to play alot,(nerd alert).
I started with D&D 2nd edition. We also played a bunch of the Palladium games: Robotech, TMNT(awesome fun), Rifts, a superhero game I can not remember the name of,(help me out here). Some Twilight 2000. Also played the Star Wars d6 game,(also super fun). I also got turned on to a modern horror game called Bureau 13,(very fun).
I would probably still play, but I don't hang out with any gamers anymore.