Joel hits on this on the first page (Subversion Re-education). My understanding, as a DVCS virgin, is that you commit far more often (to your local repository)

Joel hits on this on the first page (Subversion Re-education). My understanding, as a DVCS virgin, is that you commit far more often (to your local repository) than with Subversion, and so Hg can more intelligently merge things. My guess is that there is some intelligence that can tell that "foo missing there, and foo added here" is actually just "foo moved from there to here", unlike SVN, which attempts no such heuristics. I hope someone can correct me if I'm wrong here :)