How Hackable Is The iPaq IA-1 Internet Appliance?

BenTheDewpendent writes: "I am considering buying a Compaq iPaq IA-1 Internet Appliance if it is hackable. The IA-1 is relatively cheap and doesn't seem to be too bad in spec. I was wondering if anyone knows if they are hackable or usable beyond their intended semi-lame designed purpose?" There's a short (and lukewarm) review at TechTV about this machine which lists decent specs but objects to a highish price for what it contains. If you have a bargain, though, it sounds fun. Anyone have a succesful experiment with one of these cute boxes?