This is slightly old news but I figured I'd mention it because I'm very excited about it:
The XNA Express kit has been released, you can grab it here.
Now, for the reason I'm soo excited about it. Mitch Walker, a fellow MSDN blogger, has a superb demo on building game components. After seeing the demo, I realized how far game development has come: we're almost to the point where we can easily drag and drop features into a game.
I recommend you check out Mitch's blog here.