It gets more tempting the more I look at it.
See the faq, at
http://www.raspberrypi.org/faqsI like the fact it has it's own on-board switch-mode PSUs, so it should be possible to run it, for a couple of hours at least, from something like AA batteries and no more additional hardware beyond the battery clips themselves.
Personally, rather than traditional 'screen & keyboard' systems, I'm thinking more along the possibilities of 'headless' hand-held toys & gadgets, with remote access capability (eg telnet) when a need arises to look inside. I've messed around in that area in the past with PIC Microcontrollers, but there's a limit to what can be done DIY these days, without access to surface-mount soldering technology and multi-layer PCB prototyping facilities (& costs). This device would seem to overcome that hurdle.
Hmmm, even if none of these dreams come to fruition, once again I'll thank Mike for drawing this to our attention. So many ideas... :clap2: