Now, this isn't anything new, mind, but I thought I'd draw some attention to how the Lucky Star thread just keeps on rolling. The best part is the way it seems to regularly attract both new members (here's to you, Sabrina) and old members who're new to the show.
Link leads to the most recent page. To be fair, I should also tip my hat to the Bleach and Naruto manga threads, which have maintained a similar long-term liveliness. Confession: I read these regularly even though I don't follow either series. The speculation and debates are interesting even when you have only the faintest idea of what's being talked about.
*Just for fun, what would you subtitle the Lucky Star thread? (The first thing that popped into my head was Lucky Star: Don't Forget Your Sailor Uniform, followed by Lucky Star: Bringing Chocolate Coronets Back in Style. You guys can do way better.)