Slashdot has a couple of stories today on interesting Xbox and XDK hacks.

One's a bit old, originally written in June and updated on July 20th-- it's a version of the MAME console emulator running on an XDK along with several photos and screenshots.

Icrontic has an Xbox Dissection article up, also with many pictures. The conclusion says:

Microsoft appears to have hard locked what kind of hardware is allowed on this machine. That doesn't mean it can't be hacked or tricked to allow upgrading. It's only a matter of time before someone figures it out. The Xbox IS modifiable, we just need to figure out how.

A summary of interesting points:

Some Xboxes have 8GB Western Digital drives, while others have the 10GB Seagate drive as originally announced.

The filesystem on these drives cant be recognized by a normal Windows PC. But people are working on reverse engineering the filesystem.

Apparently, extra memory could be soldered to the board, to give a production Xbox 128MB like an XDK. (No sign of whether or not any Xbox game would use it, of course).

There's no shielding on the power supply and no CPU fan. The riser card that controllers plug into can probably be hacked to support standard USB devices.

The CPU is not just a Celeron-- it's the BGA mobile Celeron and it's soldered directly onto the motherboard, making upgrades difficult if not impossible, although overclocking may be possible.

The Xbox's motherboard can support ATA100, but this has apparently been disabled.

UPDATE: HardOCP has also dissected their Xbox and provided pictures and commentary. Thanks to babyharpseal at Blue Yonder for the heads-up.

TechTV has done the same; thanks to Negative at XboxFaction for the update.