I don't currently, but I have been considering it for personal projects as a trial balloon.<p>At work it sometimes feels tough enough to make sure everyone is comfortable enough with git to push to the step of hoping for signed commits.<p>Though, as I think of it, as the guy most likely to create version tags, it might be good enough that I adopt the practice, at least for those. Then again, I've not seen a strong need on the projects at work.