I asked Jesper about this earlier, and I finally understand what's going on. Bitbucket allows users to hook up a custom domain to point to https://bitbucket.org/:username. At some point, a user pointed hg.osunix.org at Bitbucket. At that time, visitors to the custom domain would have been presented with that user's profile. Since then, though, the user has removed the CNAME in his account settings, so we no longer know which user's profile to display. Now, when people visit hg.osunix.org we display the Bitbucket home page. This is very confusing, but I'm not sure that there's anything we can do at our end to alleviate this confusion.