I mentioned this at the Forum on Thursday and people asked for more info.
The new crop of EM8500 DVD players (the ones that are fairly cheap and support DivX) seem to be powered by Linux. You can get these for aruond £120, for example at:
http://www.blankdiscshop.co.uk/acatalog/Hardware_Section__.html
(the LiteOn LVD-2001 about half way down).
LiteOn's page for the player: http://www.liteonit.com/DC/english/lvd_2001.htm Sigma's development kit is Linux based: http://www.sigmadesigns.com/products/em8500.htm Some info about other EM8500 players: http://www.duke.edu/~java32/bravo/bravohacking.html
If I didn't have a DVD player already I think I'd be buying one of these to play with.
J.