Since I partly learnt programming at college and was taught about CSP and Occam, erlang's lightweight processes and inter-process communication model are very appealing. And it's interesting to see a number of projects get written in it, and since even Facebook is using it... :-)

This particular article references Tim Bray's attempts to use erlang for web log processing. He found erlang to be very slow because of the I/O implementation, and criticized it for its regular expression handling. This seems like a silly test since surely you'd use Perl and friends for something like that.

Personally, I'm interested in building something with erlang just to get my feet wet with the language. And I'd be interested to hear about the experiences of others with erlang in real projects.