I just put up a blog entry
here detailing my hardware hack of the Kindle DX... Bluetooth!
I added a SparkFun Bluetooth Mate TTL-serial to Bluetooth (SPP) module under the gray bezel, added pppd, and ended up with a wireless ssh to my Kindle with no outward signs of modification.
Nice, eh?
This is my little hack. I've basically just nicely packaged the great work of others. I'm getting my good hack ready to post soon.