Great new update being released next week - particularly this
"under the marketplace menu, you'll also find a new menu link called Active Downloads. Guess what that means? You'll be able to queue up to six different, be they movies, game demos, or themes. The download feature is niftier than that. You can have six downloads queued up and play a full retail or Xbox Live Arcade game simultaneously without interruptions or slowdown, according to Microsoft. You also can prioritize the order in which you download the items mid-stream, if you want to. Finally, if you want to play a multiplayer game, the downloads will automatically stop and pick up when you finish playing online. Nifty."
and to a lesser extent this
"Microsoft fixed the start-up functionality. Now, if you have left a disc in the system and boot it up, there's an option to go straight to the main dashboard, as opposed to automatically (and frustratingly) launching the inserted game. You won't have to stop the game, and then switch to the dashboard"
full article
http://xbox360.ign.com/articles/710/710202p1.html