As you already know, XNA 3.0 is out and you can now start submitting games to XBLCG for real. Well Nick has made a fantastic post about a feature of the new Xna site. In the post, May The Playtest Be With You, Nick discusses the importance of not clogging the review pipeline with a game that hasn’t been tested by others.
So if you are about to submit a game for review and have not had anyone look at it, be sure to use the playtest feature. If nothing else, give the game to a few friends to try out.