We are using it at Janrain [ http://janrain.com http://janrain.com ] for a web-hook/callback system. It will go into production over the next few weeks and is a

We are using it at Janrain [ http://janrain.com http://janrain.com ] for a web-hook/callback system. It will go into production over the next few weeks and is an important feature which will need to deal with a heavy load. It has worked out great so far. Might write about our experiences once it has a few miles on it.