Starting with the beta launch of the Xbox LIVE Community Games service later this spring, subscribers of the XNA Creators Club will be able to submit their own game creations for self-distribution through to Xbox LIVE Marketplace via the http://creators.xna.com website. A community of their subscriber peers will be given a chance to download, play and review the game and its content for appropriateness and conformance to the service’s TOS. Should it pass, the game will then be added to the global games catalog on Xbox LIVE Marketplace and available to gamers worldwide connected to Xbox LIVE.
More info here...
Now a hobbyists like ourselves need not secure a publishing contract just to give the XBOX version of our game away!