Slush, Eleuthria, glad to see you agreed on and developed a nice protocol for the future. I've been swamped by real life issues for a while now, but I will look to implementing native cgminer support when time permits which will hopefully be soon.
Nice to hear from you again after a hectic two weeks. Sorry to hear that the reason you were away wasn't a positive situation. Whenever you're looking to sit down and play with some code, slush and I are in #stratum, and normally at least one of us is around.
For Stratum testers out there, BTC Guild just introduced dynamic difficulty using the mining.set_difficulty method, with target share rates of between 1 per 3 seconds (faster = diff increased) and 1 per 10 seconds (slower = diff decreased if not already at diff=1). If you have a large farm, you might enjoy hooking up some bandwidth monitoring to your proxy to take a look at how small the network overhead become (make sure you only monitor the non-LAN traffic, since the miners still talk with getwork to the proxy).