The following represents only those games played at the club, not other games that I personally played.
Amun Re x 2: A club staple.
Attika: I played this one, and I really did not enjoy it two player. I am looking forward to trying it multiplayer.
Cosmic Encounter: Mayfair. A hoot, although a new player had the audacity to compare this to "Munchkin on steroids".
Dvonn: Enjoyable little two player, if played a few times in a row. Still have little idea of what I'm doing, as there are a few too many libeties available for each move.
El Grande: Another club staple, that gets less play only because it is longer.
Geschenkt x 4: A club staple, quick and multiplayer.
Go: I wish it would become a club staple. Played on a 9x9 board, quick and endlessly fun.
Grave Robbers From Outer Space: don't ask.
Magic: the Gathering x 3: still fun, with the few members who know how to play. Endless fun with no preparation required when drafting random cards.
Oceania: also quick, with more than meets the eye, but not that much more.
Pente x 12: another quickie, still good for two players.
Puerto Rico + expansions: almost never played straight anymore, since some of my expansion buildings are (IOHO) better than the originals and/or official expansions.
Railroads of Catan: long and complicated, and fun. rules available on my site. I am thinking of making a quicker less brain intensive version for next time.
San Juan x 3: medium length for the half hour wait until an expected latecomer shows up, or while waiting for one group to end. A staple.
Taj Mahal: A great game, 3-5 players. A little tough to catch up when behind, however.
Tikal: Ditto, but from 2-4 players.
Torres: Ditto, but more cerebral.
Traumfabrik: Fun, but not earth shatteringly so. Works well as an intro game for non-gamers.
Web of Power: Played once, and really it. Must play again to get a firmer impression.