Whizbang Dustyboots
Gnometown Hero
Look at the main RPG forum. People tag the games they're interested in -- the first page has threads tagged with Pathfinder and AD&D, and no one who doesn't play those games (or is interested in those games, probably more accurately) are fooled into thinking they're something other than what they are.I'm a relative newbie, having been into RPGs and on EN World for less than two years, but I think the current system works well. I primarily play 4e, and I imagine that discussions about rules and builds for 4e characters and campaigns would be annoying to people who don't play the game.
The existing 4E tags could be used to the same effect.