After reading a case study, I have to admit that they did something new to me. I would have to see a few more examples and let it sit to see how I could use it, but that is just how I learn.

I was vaguely reminded of how Coroutines in C managed to get C to act like it had coroutines, which it manifestly does not, by rewriting the C in a clever automated way. I don't think that is very close to what the AOP people are doing, but it was what came to mind for me. (BTW I got that link from japhy a while ago.)