[posborne]

Yes, it has been done before... But I don't think it has been done in an environment where you need to scale up quickly.

They had a problem, they solved it in a very cool fashion using the best tool for the job (Erlang), they thought of a very good way of testing the application, and they were gracious enough to share their experiences with us, other developers...

Seems like a win all around, so I'm not going to complain.