Ahhh, Runequest, my first RPG back in 1980 when I was 10 years old. Great game, I really loved the Chaosium rules, not so much the revised AH rules, though.
So I also play the following (when schedules allow); Dungeons and Dragons (3.5 ed.), The Hero System (Champions, Fantasy Hero, etc.), Heroquest and Advanced Heroquest, World of Warcraft D20 rules. There are a few others, and some boardgames/card games my group of friends play, but very infrequently.