(or, what I did over summer vacation)
For the last few months, I have been working with the Bitbucket team at Atlassian. I switched over to this team at the beginning of the summer to help build a new inline commenting feature on pull requests and commit pages, to help make the tool more useful for code reviews in a team.
It was a great project, and I wrote up a story of how we built inline comments for pull requests and commits over at the Bitbucket blog. Check it out!