[etherealG]

I think the core idea here is beyond the javascript it's implemented in. I've never seen a debugger that can do this kind of async debugging before anywhere.

Don't you think it's more novel than being some trick only relevant to front end web development work?

[NickPollard]

At the ScalaX conference last year, someone demoed the Scala plugin for Eclipse debugging actor messages asynchronously, so you can breakpoint on receiving a message, then see the callstack that generated that message on a different actor, and in fact follow back through all the messages leading up to that. Very cool, though I haven't tried it in production yet (I'm currently using IntelliJ for Scala)

[BrandonLive]

You must not use Visual Studio (or IE). Not only do both of those already do this for JS, but VS does the same thing for C++ and C#.