Michael Feldstein had this excellent Blog post:
http://mfeldstein.com/connecting-blackboard-to-sakai-and-moodle/
It followed up this excellent blog post by Michael Korcuska:
http://sakaiblog.korcuska.net/2008/07/16/blackboard-sakai-connector/
I just had to comment in Michael F’s blog – could not resist… Here is my comment…