Digital photo keyrings are around $10: eg http://www.pixmania.co.uk/uk/uk/2023270/art/vtec/digital-pho...

One guy hacked one (different model), and found its CPU was a 6502 (same as Apple 2e). I don't think linux runs on that, as no memory protection. http://spritesmods.com/?art=picframe&page=1

http://picframe.spritesserver.nl/wiki/index.php/Main_Page

Getting cheaper all the time - how long til it disrupts PC/windows/intel?