Curious Blend of VPN, PDA and USB Drive

An anonymous reader writes "Realm Systems has developed a cellphone-sized mobile device that takes advantage of the hardware of a another PC by attaching via USB. It requires an Internet connection to connect to a backend system, but acts as a fully functional PC with dual PowerPC processors, a 20 GB drive and all your applications - if you can find someone who lets you connect to their PC. An interesting option especially for a price of $195 for the mobile device." So, for a $10,000 central server, a $1000 PC, and a $195 device, you can have the computing power of: a $1000 PC. It seems like there might be cheaper ways.