The idea is to use XNA to port the game to the 360. As of right now i've got it set up so that you can have 4 different players at a time. You can pick up a variety of weapons and fire. The one thing that really makes this different from my last game is that with this one you can spin your camera and go anywhere in space that you like.
I'm still learning XNA, but today i found out about additive blending (and subtractive blending.) _Thanks to an article on the XNA developers page_ Here are a few examples of my explosions:
And here is the work i've been doing with pixel shaders: