The Amstrad E3 is a cheap (£14.99 at the time of writing) videophone, which runs Linux.

More info:

External links:

Simple Serial Cable:

In case other people are as useless as I am at building serial cables - here is the pin out I'm using to connect my E3 to a 9-Pin D serial port on my PC.

Or you can use a level shifter, a universal (i.e. E2/E3) design is available here http://www.cambridgewargames.org.uk/members/andy/emailer/

Or, if you're handy with a soldering iron ["Serial cable for the paranoid"] provides some over-voltage protection for the E3.