If anyone wants to play with rethink's (awesome) web UI, we setup a demo here: http://rethinkdb.a.pogoapp.com
We ran into a little bug w/ the ajax requests using the wrong port when run behind an nginx reverse proxy, and the team was very helpful and responsive in getting it fixed: https://github.com/rethinkdb/rethinkdb/issues/63
Seems like a very promising project