There have been a couple of interesting recent developments concerning the attempts to hack the Xbox for a variety of purposes: to modify game files, install custom programs and operating systems (Linux), play foreign games and DVDs, and, yes, even-- to make illegal copies of games and movies.

CNET has a story about Lik-Sang's mod chip for the Xbox.

XBOXHACKER has an item up on a white paper available from an MIT ftp server that documents something called the XBOX LDT bus . I have no idea what that means, but apparently it's about the Xbox's boot procedures and security system.

The white paper itself has been slashdotted because of this story, which you might also find interesting.