Hello Peter,
I suggested to the author of the very feature rich LaTeX-Listings package, Carsten Heinz, to port this package to ConTeXt, and it seems, that he is interested. But before doing it, there are some questions:
* What do Hans and other people thing about that?
Hmm, I never use listings.sty with LaTeX. Once I used the ConTeXt variant of listings.sty. Perhaps the ConTeXt built in support for listings is sufficient.
* listings.sty uses keyval.sty, how is the proper ConTeXt-way to do the same things as keyval, or should listings stay with keyval?
I'd suggest to go for the ConTeXt specific. I could help with it. See syst-gen.tex and syst-ext.tex for details on the macros for a=b kind of assignments in ConTeXt. Patrick -- texshow-web: http://members.ping.de:8061 ConTeXt wiki: http://members.ping.de:8062