I really adore using Erlang with Webmachine, jQuery Taconite, and erlydtl for web projects. It's usually not a morally safe option for other people's projects (because what are the odds of them finding an Erlang programmer to work on it after I'm gone?), but it's a joy for my own projects. Easy, and as functional as you want to be:)

edit to add links:

https://github.com/basho/webmachine

http://www.malsup.com/jquery/taconite/

https://github.com/evanmiller/erlydtl