Hello!
I have noticed that colanderutil has a very neat implementation of a Colander -> JSON schema converter, and that you were considering moving this implementation into a separate package (https://github.com/sbrauer/Audrey/blob/master/audrey/colanderutil.py#L171-L172).
I shall say that this is the kind of a package I am looking for, and that I am not alone :) Could you take a look at the following ticket and see if you can help us with releasing such a package? Thanks!
Pylons/colander#112