This may not be precisely what you're looking for but it is close:
CodeCrawler shows a nice range of metrics in interesting and possibly
even useful ways.

http://www.iam.unibe.ch/~lanza/about.html

Here are some examples of it in use:

http://www.iam.unibe.ch/~lanza/ccex1.html

-- Dwight


Daniel Vainsencher wrote:
> 
> I recall reading a very interesting paper (IIRC, in JOOP) about various
> metrics for the complexity of methods/classes/categories. These were
> integrated into the browser, and used as a source of feedback on new/existing
> code.
> 
> The paper also summerized results of applying these metrics to the big
> implementations.
> 
> I think this might be a useful tool to port to Squeak. Anyone have any
> pointers to the results/code/authors of this work?
> 
> Daniel