Wow, my list won't be as extensive but I am getting LOTS of ideas for new games I want to try
D&D Basic/Expert Started with these books running my cousin and a couple of friends through the 'B' series of modules (notably B1 to 5). Later we went to..
AD&D 1st & 2nd Edition Played both for about 2 years each but 2E drove me from RPGs for almost 3 years.
Warhammer Fantasy Roleplay Ran several comapigns in this system the longest lasted over 2 years. Still my all time favourite RPG (but 3E has come awful close to unseating it)
D&D 3E Well it brought me back to D&D after a 7 year absence. Have been playing and DMing it almost constantly since it was released. Recently took a break after my campaign wrapped up a the beginning of summer to play....
d20 Star Wars Revised An excellent Star Wars adaptation. Far superior to the old WEG version IMO. Been playing a Wookiee Jedi Guardian and having a blast! Would love to GM my own game soon.
Call of Cthulhu (3rd, 4th & 5th eds) While I haven't tried the d20 version (but would like too) I have played this game on and off for 12 years. Most often as one night games and at tournaments. Oddly I have only been a player maybe twice but have GMed it dozens of time - I love the horror aspects of this game and have always been a big fan of Lovecraft.
Traveller (Classic only) I haven't played this in over 10 years but it was the second RPG I ever played (Basic D&D was first). I have a large collection of the classic Traveller booklets as well as the hardback version of the main rules. Never got into Megatraveller or the Traveller re-release Marc Miller put out in 1997(?). I am very excited about T20 however and will probably pick it up and try jumping back into the Imperium!
Shadowrun While I don't own the main rulebook I have played it enough that I have to include it here. Besides my FLGS now has a copy on hold for me some I will probably pick it up this month. I mainly played this during tournaments and 'one-off' sessions.
That's about it for games that I play or have played on anything resembling a regular basis. Now for games that I own that I plan to use in the future I would include;
Feng Shui Just got a used copy of this last month and it looks fantastic. Can't wait to give it a try.
Hero 5th edition Also picked this up used last month and am very axious to try it out with a Supers campaign. Don't know whether to go silly or serious with it though.
Hackmaster bought the PHB for this some time ago and have played it once but a dearly want to give it a serious go once I get a hold of the GMG and DM Screen.
and for games that i have seen in this thread that I now want to try lets just add
Exalted, BESM, Gamma World (or Omega World), Deadlands and 7th Sea
*whew* that was a bigger list than I thought it would be.