I'd be worried about strangers opening issues about my house...
Partly I chose Github for user experience - it's a pretty good and simple issue tracker.
Partly it was ease of setup time, Github was to hand.
Partly I'm curious whether it being public can help. People might come and give advice on bugs, and in theory workmen could turn up and give me spontaneous quotes.
I was going to write a blog post about it before posting to Hacker News, looks like somebody else beat me to it!
It also lets you tack on collaborators to share the blame and responsibility. :)
Of course, you could well argue that it's a problem that it doesn't have the push, alert, and geofencing capabilities that make to-do services great to have.
Better support for discussions and tagging/prio?