Heh, I'd forgotten about that one :D. I've had the idea kicking around for a long time, and have spiked it in a few different languages (the Haskell version was mainly to try out FRP and reactive-banana; I've got the furthest on a Python one that hinges around agents tied to RabbitMQ as my current "production" deployment).
I'll try and get the Elixir stuff cleaned up and published over the next week :). The only source I've implemented so far is inotify (for eventing off Dropbox, so I can rebuild my blog); so far I've spent most of my time digging into the vagaries of the OTP and Erlang as a platform, rather than implementing.