I wrote a distributed sat-solver in Erlang (good old fashioned search problem). It was my intro project to get to know the language. Has been great fun and now Erlang is in charge of computers talking to each other while Java takes care of the heavy lifting. Also a similar problem solved with Erlang (nothing to do with me), and featured here on hacker news...

http://blog.ezyang.com/2010/08/tour-of-preach-distributed-er...

Great stuff. Erlang may make you smile (again).