http://www.digitalgemstones.com/projects/b/
It's not very active, but it's the same idea. Distributed bug tracking has been around for a long time. I think Fossil also does it and probably has the tightest integration, since it's Fossil.
@stephenr: Well then you'll miss stuff like that. I honestly recommend checking out git in depth in your spare time. Just like learning lisp it will increase your programming skills even if you never use git in production! Maybe you come to love it for the same reason I do: incredibly well done architecture under the hood. It's the first time I could completely grasp what a VCS wants to do and how it's achieving its goals.
It's like if there was a post on some other forum about kayaking and I went out of my way to say 'sorry this isn't interesting to me because I'm into cycling and don't like kayaking'. Imagine what it would be like if every HN user went down the front page and commented in every thread that mentioned a technology they don't use 'sorry I don't use this technology so this post is useless to me'.
Yes I suppose it's a totally valid opinion, but it's just entirely useless to offer it here.
"This seems interesting, but I wish it supported other VCSs - you will have to claw Mercurial from my cold dead hands!" would have made the same point, but it'd wouldn't sound like the developers somehow owed something.
Sorry but you lost my interest completely.
The cool kids can claim that git is the best thing since sliced bread all they want, you will have to claw Mercurial from my cold dead hands.