At work I had the pleasure to implement a bridge between JIRA (issue tracker) and Gitorious (open source Git repository web interface and management tool).
On the company's blog I wrote about ways to connect JIRA to Git repositories, why none of them worked for us and how we used BSOAD to re-implement the FishEye API for Gitorious in PHP: Klonfisch: Connecting JIRA with Gitorious.