Is there an IDE out there that does structural syntax highlighting?

Question

Somewhat inspired by this question about a graphical programming environment. I don\'t think that C++ or C# are really conducive to this type of environment, but perhaps there\

Answer 1

I'm the author of Codekana. Indeed, what you describe above was the main goal for the product. BTW, I'm about to publish an article about the "making of" and the underlying technology, which is pretty nifty. It will probably be available next week (March 26, '09 or so). Recommended reading, if I may say so myself.

The reason Codekana only provides outlines, instead of a colored background, are limitations in VS's text rendering extensibility. I will hopefully be able to implement a solid-background version at some point in the future, although it will definitely require serious hacking and "rocket surgery".

I would have commented above, instead of providing another answer, but my reputation doesn't allow commenting. :(

[UPDATE: Thanks for the upvotes, now I can comment!]