I don't think there's anything really to be said here other than wow and thanks.
Honestly, it's nice to have the biggest web company just reach out and lend a hand to random projects around the net. From JQuery to Linux. That's pretty impressive. People will post about ulterior motives and incentives, but at the end of the day, it's just a good thing (TM).
There were problems of availability for a while after kernel.org got hacked, admins weren't very quick to restore services from a blank slate (I believe git access took four weeks). Some developers mirrored their stuff on github or repo.or.cz, but it wasn't systematic. Auto-mirroring by Google will make verification and disaster-recovery easier and faster.
Honestly, it's nice to have the biggest web company just reach out and lend a hand to random projects around the net. From JQuery to Linux. That's pretty impressive. People will post about ulterior motives and incentives, but at the end of the day, it's just a good thing (TM).