For distributed SCM, I've got enjoyment out of darcs documentation over the years (ie: http://en.wikibooks.org/wiki/Understanding_Darcs/Patch_theory http://en.w

For distributed SCM, I've got enjoyment out of darcs documentation over the years (ie: http://en.wikibooks.org/wiki/Understanding_Darcs/Patch_theory http://en.wikibooks.org/wiki/Understanding_Darcs/Patch_theor...), and fossil (http://www.fossil-scm.org/index.html/doc/tip/www/permutedindex.wiki#pindex http://www.fossil-scm.org/index.html/doc/tip/www/permutedind..., specifically http://www.fossil-scm.org/index.html/doc/tip/www/tech_overview.wiki http://www.fossil-scm.org/index.html/doc/tip/www/tech_overvi..., http://www.fossil-scm.org/index.html/doc/tip/www/concepts.wiki http://www.fossil-scm.org/index.html/doc/tip/www/concepts.wi..., http://www.fossil-scm.org/index.html/doc/tip/www/fileformat.wiki http://www.fossil-scm.org/index.html/doc/tip/www/fileformat...., etc)