From one of the famous Domino hackers, Damien Katz (who is now on the couch and not
working for anyone, but spending his time on building useful things, enjoying family etc. you can read about his story here) comes a cool document DB program - CouchDb.
I have been following it for over a year now, and Damien is starting to post first notes about the alpha release. I am personally excited to play with it. The really cool part is that he used ERLANG to build it.
You rock DUDE!