I don’t have an Xbox, but if I did, right now I’d be playing Insanely Twisted Shadow Planet, created by Joe Olson and Michel Gagné. I’ve been excited to see how Gagné’s beautiful FX animations translate to a gaming environment since the initial trailer came out in 2007. Gagné’s previous work includes the Ratatouille taste visualizations, The Iron Giant FX, and his epic short, Prelude to Eden.
The ITSP blog has beautiful concept art and screen shots. There’s a free trial version on Xbox Live Arcarde.