Sean McHugh at myITforum.com

Following close on the heels of the Zune 2.5 software/firmware update, Microsoft has released the XNA 3.0 Game studio with Zune support support!

It is still a Community Technical Preview (read: beta) but if you're brave, you can get games on your Zune now!  If you program, you can also start creating Zune games.

Download here:

http://blogs.msdn.com/xna/archive/2008/05/07/announcing-xna-game-studio-3-0-community-technical-preview-ctp.aspx
 

There are already a couple of games out there (for orignal Zunes and V2 Zunes) and there are some excellent step by step guides to installing and compiling them for use at the following links:

http://www.zuneboards.com/forums/tutorials/23605-installing-game-xna-your-zune.html#post216424
 
http://www.zunescene.mobi/forums/index.php?topic=37524.0
 
http://www.zunescene.mobi/forums/index.php?topic=37503.0

I expect there will be a lot of games showing up pretty quickly and I am looking forward to getting mine set up for gaming tonight.

Disclaimer: I have not installed these games on my Zune yet, and there is a known issue where exiting out of a game can cause the Zune to reset, but that seems a small price to pay to me...  I'll update once I have games running on my Zune.