A friend and colleague (and current project member, actually) has created a game on the XNA platform. The game has been competing in various contests but is now nominated to .NET Awards, which is the arguable most prestigious award in the Microsoft community in Sweden.
The game is called Bullet Hell Tactics and is great fun. Please download a try out version and then vote, vote, vote for Jens (Team Shmup) and his game on the .NET Award site