Re. "Can you afford to not know Git any longer?"

Re. http://www.bluetrainsoftware.com/2012/03/can-you-afford-to-not-know-git-any.html
Well said.
The videos (longish at an hour each or so, worthwhile IMO) of Google Talks by Linus Torvalds and Randal L. Schwartz are great for explaining the rationale behind GIT and its development.
They may even provide sufficient motivation for people to dive in. Pushed me over the edge ;-)

Scott Chacon at Strange Loop 2011 -- GIT - Tale of Three Trees

http://www.infoq.com/presentations/A-Tale-of-Three-Trees

Wolfson AudioPlus Linux device drivers page -- incl git

http://opensource.wolfsonmicro.com/node/8

Amoocon?

http://www.amoocon.de/2010

Mobile / VoIP themes - and Git! :)

Git Quick Reference online - Scott Chacon

http://gitref.org/

By Scott Chacon - the same author as the Pro Git (Apress pub.) book

Looks very handy