That's pretty cool. Like an asynchronous functional version of Cocoa's Distributed Objects.

Are there ever problems with one side referencing objects that no longer exist on the other side?

I've run into these kinds of problems due to the lack of weak references in JavaScript. Hopefully a future version of JavaScript [1][2] will fix that.

[1] http://wiki.ecmascript.org/doku.php?id=strawman:weak_referen...

[2] http://wiki.ecmascript.org/doku.php?id=harmony:weak_maps