Lots of games have the updates included right on the DVD, but if you remain up to date on XBL you would never realize this because you never see the checks or the prompts.
For example, Crackdown, TMNT and Need for Speed: Carbon all require the Fall 2006 update to play. If you dont have it, it
won't let you play the game (even offline) until you update via the DVD. No internet connection required.
My console is still pre-Fall 2006 update so theres a few games I simply cant play.
In the end, this is how Microsoft will win, once they shut us out completely, and the new games will prompt for an update that will kill the firmware hack (whenever that day comes)

You could always buy a core system and swap your hd drive over to it and update it with the origial discs "which you should have other wise thats illegal" or even better call your friend over and swap you hdd drives and put in the game and do the update!