I've been running a Vampire the Masquerade table top game for about 7 years. It's based on the LARP in Eugene I played in for 2 years, which was based on a 5 year old LARP that my old Storyteller played in Monterrey California.
I'm also running a D&D game opposite the Vampire game. I currently play in a D&D game, a GURPS space game (based on the book Mutineer's Moon), and an Exalted game. Soon we might be playing a Beyond the Supernatural 2nd Ed game!
Also I am actually in a forum based RPG in the forums of the webcomic Weregeek. I'd love to join another but I can't get online enough nowadays to have that luxury. I would be glad to poke in and help though.
In the past I have played BESM, AD&D and D&D 3.0/3.5 in all sorts of settings (including Dragonlance, Eberron and Ravenloft), Rifts in all sorts of dimensions, Palladium Fantasy, System Failure, Beyond the Supernatural, Cyberpunk, Shadowrun, Aerotech (yes, we roleplayed beyond just the battles, it was funny), Vampire the Masquerade, Vampire Dark Ages, Mage the Ascension, the New World of Darkness (as mortal investigators), Robotech, TMNT and other Strangeness, Heroes Unlimited, West End Games' version of Star Wars, and a few failed home brew systems.
*pause for breath*
I have personally run Heroes Unlimited, Rifts, Star Wars d6, Vampire the Masquerade, Changeling the Dreaming, Werewolf the Appocalypse, Mage the Ascension, and even a little Harry Potter game that was loosely attached to the MAge the Ascension system.
I am way more of a gamer than an Otaku and as much time as I spend thinking about the convention and Pocky club, I spend twice that on my RPGs.