mxmRelations v.1.1 has been relased
mxmRelations is made to solve a few common problems with Zope's object oriented database.
Normally in a relational database some tables will be used to show relations between rows. It can be both "one to many", and "many to many".
In Zope, doing the same thing is more difficult than it has to be.
This package is a relatively easy solution to this problem
More info here