When we set out to reuse data from a BCS external content type we’ve used a couple of resources that we wanted to share. First off, the next article was a great help during the set up of user profile synchronization: http://www.harbar.net/articles/sp2010ups.aspx
Then, the following post was a nice walk thru showing how to set up user profile imports using BCS: http://www.dotnetfunda.com/articles/article1628-user-profile-imports-using-bcs.aspx
Finally, when we saw that the import (using miisclient.exe) failed because of a missing anchor component, the following post was a life saver: http://www.sharepointfabian.com/blog/Lists/Posts/Post.aspx?ID=193
