If you're looking for an Erlang web framework check out Chicago Boss. Brand new tutorial and everything:

http://www.chicagoboss.org/

Of course, the project still needs some performance work, as highlighted in this post:

http://labs.evolope.com/post/16054431816/a-comparison-of-web...

So CB is a long way from its theoretical maximum (largely because I haven't done any performance engineering on it yet).

"Performance", by the way, depends largely on the task at hand. For complex template rendering/delivery, Erlang will probably beat anything out there because of Erlang's intelligent use of immutable data and I/O lists. Most other languages do a "memcpy" for every chunk of the template as it's being built into a final string. Erlang, on the other hand, keeps around pointers to the separate pieces of memory and then does a scattered write (writev) when it's time to send the result to the client.