"Projects outside the kernel began adopting Git shortly after its release. A key landmark in Git adoption came when Keith Packard, one of the lead developers of the X Window System, published two influential articles in 2007."
It's exactly what it sounds like.
Handy info on branching and merging with Git.
Yet another Git tutorial that proved useful to me at some point.
Looks like a successor to Blosxom and PyBlosxom and maybe also IkiWiki.
I swear I remember this diagram from the GNU Arch days.
Stet is a cool piece of software that was used in the GPLv3 process. I think there are better tools now, but it's nice that the code is now easily available online.
I agree with all of this except the suggestion that Torvalds is responsible for it. He popularized this model of development, but he didn't invent it.
I strongly suspect this will come in handy soon.