I've been working on a little arcade game to submit to the XNA Creators Club Community Games Beta. I finally finished it last weekend and submitted it Sunday night. It passed Peer Review and went live a few hours ago -- woohoo! It's not the most amazing game of all time, but it was still a lot of work to get all the details finished. I have ideas for more ambitious games to tackle soon...
Check out "Gemini 08" in the Games Catalog. Anyone with an XNA Creators Club Premium Membership can play it on the Xbox 360 for free! If you have feedback on the game, you can submit it here.
For more info about the XNA Creators Club and the Community Games Beta, check out this tour.