I think Bazaar would be more useful if they tightened up their docs to be more concise, while also splitting up the tutorial to have each of the pieces more closely focus on one particular way of working, for example:
* you're working on a project at work where the code is available via ssh at `some_host:/var/repos/the-project`.
* you're working on a project where the code is available via http from the author's site
* etc.
Currently, I think the impression they give is that you only use bzr if you're also using LaunchPad. That needs to change.
BTW, are there any other source code hosting sites that support bzr besides GNU Savannah and SF?
No, not really. There are a couple but none of them look like they belong on OS X.
I think the reason hg doesn't have any decent GUIs while git has several has to do with their command line interfaces.
git is like the ugly girl/guy that's really good in bed. Some pretty lingerie or a nice suit can go a long way toward covering up flaws and letting you focus on their strengths.
hg is the gorgeous girl/guy next door who's also great in bed. Sure, they might look even better with some fancy clothes but we're all too busy staring at their naked body to bother going to a store to buy some.