Review Board: web-based code review

We've started using Review Board for code reviews at work. It's pretty nice: setting it up is trivial (it's built on top of Django), it's fast enough (using mod_python), email notifications Just Work, and the user interface is sexy, even if it has a few quirks. It even does syntax highlighting in diffs, which is convenient. The only nit is that our workflow sometimes requires reviews of code that has already been committed in the repository, so having a revision browser in the request form would be a plus. But in any case, it's much more convenient than using email for review!

Update: fixed link.