Steve Yegge gave a dynamic language talk recently, and I have to comment on this from the Q&A segment:

Q: These great things that IDEs have, what's gonna change there, like what's gonna really help?
Well, I think the biggest thing about IDEs is... first of all, dynamic languages will catch up, in terms of sort of having feature parity. The other thing is that IDEs are increasingly going to tie themselves to the running program. Right? Because they're already kind of doing it, but it's kind of half-assed, and it's because they still have this notion of static vs. dynamic, compile-time vs. run-time, and these are... really, it's a continuum. It really is. You know, I mean, because you can invoke the compiler at run time.

Hmm - that sounds a lot like what Smalltalk has done for, I don't know, 3 decades now :)

You could have a look at this video to see what I mean.