Hm, I'm playing tabletops a little bit too...
Our round started a couple years ago (2002 or so?) with DSA, more or less the german equivalent to D&D. Same GM for the whole campaign we played through, that poor guy... Took us only, uh, 5? years, with one meeting per week for 6h in general. Yeah, we tend to discuss what out characters plan to do too much ^^
After that it was some smaller systems, some beta testing for new systems (we know some people from the industry, helps with getting all those books sometimes cheaper ^^), and we tried our luck at the then new Starwars D20 and their official free campaign... Didn't do much of that one though.
Had a year of almost not meeting for tabletops then.
For the last two years it's now either Shadowrun (me as GM, waiting for the 5th edition ruleset now to get rid of those 4th ed broken rules) or Savage Worlds as Ruleset in our own open fantasy setting. Luckily I'm not the GM for that...
Oh, and every year on Halloween it's one evening of Call of Cthulhu.
Arkham Horror is btw great too, but starts to be a PITA when you play with 7 people and two to three of the big addons...