I recently joined orkut.com, and find it pretty interesting to participate in a community based soley upon invitations/trust. One of the first interesting things I discovered was a link to a cute toy apparently sold in the Bletchley Park Museum: a single rotor Enigma machine. Nifty! You can read more about it Stuart Savory’s Pocket Enigma®: The revised Review

I may have to write a Python implementation and then cryptoanalyze it.