We've used both Unity and MonoTouch for different projects. They have their problems, but much less so, I think, than different native implementations on every

We've used both Unity and MonoTouch for different projects. They have their problems, but much less so, I think, than different native implementations on every platform. On the server side, we just build the latest stable mono release and we made a socket server wrapped around libev (similar to what Manos de Mono does). (I guess I lied, we have a small amount of web stuff in Ruby, but mostly just to serve content.)