bts-link is a very useful tool which helps keep track of bug status changes when a Debian bug has been marked as linked to another bug in an other (upstream) bugtracker.
I’ve prepared some slides of introduction for our partners in Helios to introduce them to that tool :
These slides can also be found on the helios site (ODP source).
Also, I’ve started contributing to bts-link in the frame of our work on Helios, and I’m glad my contributions have been integrated, although learning git in the way was kind of a pain 
More details about bts-link at : http://bts-link.alioth.debian.org/
