7 Version Control Systems
http://www.smashingmagazine.com/2008/09/18/the-top-7-open-source-version-control-systems/
CVS manual
http://ftp.gnu.org/non-gnu/cvs/source/stable/1.11.23/cederqvist-1.11.23.pdf
Subversion manual
http://svnbook.red-bean.com/
Git manual
http://www.kernel.org/pub/software/scm/git/docs/v1.7.0.5/git.html
Tourtoise CVS
http://www.tortoisecvs.org/download.shtml
RapidSVN
http://rapidsvn.tigris.org/
Tourtouse SVN
http://tortoisesvn.net/downloads