Go join throneland, a Game of Thrones challenge community. Here you apply for a team, either Team Stark, Team Lannister, or Team Targaryen. If you're a Game of Thrones fan, trust me, you won't be disappointed. Apply for your team here. Make sure you read the rules! :) And do tell them that dust_and_glory referred you!
There's a tarot rumble round currently being hosted over at wd_lims. It's a change from the usual LIMS challenges that are held there, so make sure you don't miss out on all the fun. You can sign up here before the 24th of June, which is when voting for the first challenge commences.