Yip Yip is a duo from Orlando, Florida. Last weekend they played at Indie Summer Festival with Viernes, Tumbleweave, Band In Heaven, Dark Sea of Awareness, us, and a bunch of other really great bands. Their setup is really crazy, check it out in this video below, with them performing their song "Bone Up".
Costumes, a large mass of equipment, strange half video game/foriegn alien noises, they definitely have their own thing going on. And they've been doing this for about a decade now--They've had 10 releases since 2001 and from talking to Brian it sounds like they have another album on the way.