Quoting stéphane ducasse <ducasse at iam.unibe.ch>:

> You have to look at Monticello :). The idea is that a category is a 
> package then you have to mark class extension using *mycategory
> then you can publish a package on a ftp, disk, http server and this is 
> really cool. Because you get all your code away from an image in a save 
> and
> reproduceable environment. I can send you the extremely limited doc I 
> started to do for my students. (but this is really limited 3 pages).
> Shout is really cool.

There's also more documentation on the Monticello wiki
(http://www.wiresong.ca/Monticello/) and support is available on the mailing
list (http://mail.wiresong.ca/mailman/listinfo/monticello).