That looks really cool; how's that been working out? Is that in production? If Ruby had Gambit Scheme's serializable continuations, that would be pretty interesting times.
We're not yet using it in production, its only a few weeks old, but we will be in some of the things we're working on.
One of the main benefits is letting us run objective-j and cappuccino on the server, letting us share application data models in the client and the server.
