git-annex is growing up a nice community that nags me about things like Mac OSX and FAT filesystem support. It's great to have their feedback, it's been leading to fast improvement, even though I've only gotten two patches to my haskell code. :)
New users are finding Branchable despite us not knowing how to market it. Sometimes a new site springs up overnight fully formed, having been developed on a laptop and git pushed to us. I get a vicarious thrill over whatever our users are doing, be it driving to Mongolia or watering plants with arduino.