I tried using gitstats (http://gitstats.sourceforge.net/), but the damn thing doesn't generate graphs.
It requires gnuplot, which requires a bunch of other libs to be installed, none of which have a native OS X port. I've spent 4 hours trying to figure out how to install libpng to install libgd, to install lib... forget it.
Anyone know of a simpler way of generating visual git stat report for OS X?