In practice this works really, really well. I've used it quite a bit in my own internal stuff, but I'd love to see a wider adoption among other developers -- t

In practice this works really, really well. I've used it quite a bit in my own internal stuff, but I'd love to see a wider adoption among other developers -- there currently aren't many applications with this support built in (including Apple's own). The dirty/clean marking mechanism is pretty simple; as long as the number of dirty calls equal the number of clean calls, it's considered safe to kill.