Off on a tangent here... I wonder how many non-development users Bazaar has?
I'm a systems administrator, and when setting up some Ubuntu Server boxes I chose to version control the /etc path using etckeeper. Funnily enough, Bazaar was Ubuntu's default choice for the VCS that etckeeper used. (etckeeper is apparently agnostic about such things.)
From using Bazaar there, it's kind of snowballed. The one bit of development I do (which isn't much) now uses Bazaar, but only behind the scenes - not as a DVCS. I just picked it because I was familiar with it.
I also use it to version control my writing (mostly short stories, some novels). That can be fairly handy when you get frustrated and delete an entire passage out of frustration, only to find two days later that the problem was elsewhere!
It's quick, simple, and with Bazaar Explorer it's pretty simple even for a novice to use. It may not be the developer's first choice, but should version control really only be used by developers?
Apple have added versioning into their file handling APIs. If Canonical did the same, then I suspect they'd pick Bazaar. At this point I'm just thinking off the top of my head, mind you. But then, none of the other DVCSes are sponsored by a company that's trying to improve the computing experience.