Probably it's just me but all that mumbo jumbo dinglethingy isn't really appealing to me the least... I like the idea that I can do a lot with it but there is always a downside to everything that involves jailbreaking or hacking..
Arguably a whole lot less practical for general use, the nonetheless clever hack detailed by TinyApps involves jailbreaking the Kindle DX and then using a VNC viewer to set it up as a remote screen for your Mac.