Major pet peeve of mine is people who don't clean up their invite list and invite hundreds of inactive players to tournaments so that nobody else can forward invites.
How do I clean it up? I'd love to do so!
Regarding Peeve #7 - I've been using accept surrender because lately I have a rash of people who surrender on turn 1. I refuse to accept their surrender so that they are either forced to play or get booted. At least with the latter I can eventually filter them out with a maximum boot prerequisite.