I've been slowly switching all my code projects to use GitHub's bug tracking (GitHub Issues) in addition to their code hosting. So far I'm pretty happy with it. It's not perfect, but it's good enough. It's got a tagging system so that you can categorize your issues according to whatever set of tags you want. The tags are called labels.
Once you figure out what set of labels you want, you realize that you then have to go set the labels up over and over on all your repos. Okay, I guess. How long could that take, right?
Well, when you have a few hundred repositories, it can take long enough.
And what happens when you decide that blazing red was a stupid color for "non-critical bugs" and maybe you shouldn't have spelled "tests" with three t's.
Fortunately, GitHub has a really good API, and Pithub seems, so far, to be a very nice library for dealing with the GitHub API!