So how many different game systems have you tried?

[GAAAHHH]

Dungeons and Dragons (BECM, AD&D 1st and 2nd, 3rd, 4th)
World of Darkness (old - vampire, werewolf, changeling, mage; new - vampire, werewolf, changeling, mage, mortals)
Palladium (Fantasy, Rifts, TMNT/After the Bomb, Robotech/Shadow Chronicles, Ninjas and Superspies)
GURPS 4th (with 3rd edition supplements), GURPS Traveller
Shadowrun (1st, 2nd, 3rd editions)
Mongoose Runequest
MERP
Rolemaster 2nd edition
Deadlands, Deadlands: HOE
Savage Worlds
Earthdawn
Star Frontiers
Top Secret/S.I.
Deleria
Harn
Doctor Who (FASA)
Warhammer Fantasy (1st and 2nd), Dark Heresy
Call of Cthulhu
Battletech/Mechwarrior
Sailor Moon, Tank Police
Amazing Engine (Bughunters;For Faerie, Queen and Country)
Alternity (Star Drive, Dark Matter, Gamma World)
d6 Star Wars (and d6 Space)
Lejendary Adventure
Champions, Hero 5th edition (Post-Apocalypse Hero)


That's all I can think of right now.

 

[Dannyalcatraz]

Promethean: The Created

Played it.

 

[Jengenritz]

Just RPGS:

D&D: 2E, 3E, 3.5E, 4E, Basic
Call of Cthulhu: 3rd, 5th
World of Darkness: Vampire, Werewolf, Mage, Changeling, Wraith (during the 90s...whatever editions those where)
Legend of the Five Rings: 1st, 2nd
Heavy Gear
Shadowrun (forget edition)
Earthdawn (2nd?)
Top Secret
Gamma World
d20 Modern
Warhammer Fantasy (1st)
Champions/Hero 5th
Aberrant
Marvel Super Heroes
Mutants and Masterminds
Deadlands
FUDGE

Always wanted to play Dark Conspiracy and Paranoia (yeah, never played it).

 

[Shades of Green]

I've tried:
D&D 2E (Hebrew version and sometimes mixed with OD&D modules as well).
D&D 3.0E
Babylon Project
Shadowrun 3E
Shadowrun 4E
Classic Traveller
Mongoose Traveller

 

[Wombat]

Well thanks to these answers, I spotted several that I left off my list...

Shadowrun (2nd/3rd), GURPS (2nd, 3rd, 3th), Skyrealms of Jorune, Unknown Armies, Earthdawn (1st), Palladium, Mutants & Masterminds, True20/Blue Rose, Toon ... and probably another dozen...

Of course most of these were played only a couple of times, but still they are there

 

[SpiderMonkey]

- 1e-4e
-Mentzer Basic D&D
- RoleMaster (shudder)
- Gurps
-Marvel
- Mutants and Masterminds
- Marvel (w/ Saga system cards)
- Champions (shudder)
- Rifts
-TMNT
- Heroes Unlimited
- Beyond the Supernatural
- Rifts
- Pretty much all of the oWoD
- Old Star Wars
- d20 Star Wars
- I tried Vampire LARP a few times; never again!

I think that's all of it.

 

[avin]

D&D (AD&D, 3.0, 3.5, 4.0)
GURPS (3, 4)
Deadlands (original and D20)
World of Darkness (Vampire, Mage, Werewolf and By Night)
D20 Modern
Star Wars (d6)
3D&T (some brazilian system)
Opus Nigrum (some friend's system)
RPC

 

[Ktulu]

BCEMI, AD&D2e (w/ skills & powers), 3.x, 4e, Sorcerer RPG, Deadlands, Deadlands d20, StarWars WEG, d20/revised, Saga, d20Modern, Primetime Adventures, Shock, Serenity RPG, Savage Worlds, and Alternity.

Not a huge list, or a varied list, but I like what I like and have stuck fairly close to D&D over the years.

 

[Sanzuo]

Oh come on, not one of you nerds has played F.A.T.A.L?

 

[Rallek]

AD&D 2e
Agora: How Shall We Live?
Alternity
BattleTech
D&D 3e, 3.5e
Call of Cthulhu
CthulhuTech
Deadlands
DragonMech
HoL (everyone should make a HoL character at least once )
Homebrews
Mage: The Ascension
Nemesis
Paranoia
Pokethulhu
Rifts
Risus
Vampire: The Masquerade
Savage Worlds
ShadowRun
StarWars (WEG)
Warhammer Fantasy Roleplay 1e, 2e


I'm sure that there are more, but these are the ones that were either played often enough to leave an impression, really unique, really good, or really really really bad.... Rifts, I'm looking at you.