He introduces distributed version control and his system: GIT. If I understand it correctly: developers pull from HEAD, work independently, are able to share and merge among each other.
Apparently there are two open source distributed version control systems:
Mercurial and GIT
He’s vehemently against CVS, SVN and Perforce.
Remember he is the author of the Linux kernel (read: brilliant) and overlook his attitude. He has some really interesting things to say.