Gary Rowe and I were discussing recently what Bitcoin software you could run on a Raspberry Pi computer:http://www.raspberrypi.org/
The Model B has:
+ 700 MHz ARM system on a chip
+ 256 MB ram
+ 2 x USB
+ SD card socket
+ Cost = $35
We think we could run MultiBit with a Java runtime on the SD card.
Or a complete copy of the MultiBitMerchant software we are writing (with DynDNS entry settings.). They would not necessarily run quickly, but we think they would run.
Have a think as to whether your software would run on it and post if you think it would!