WareLogging, IdeaLogging, SourceControl.

Maybe the best reason to use version control: It will keep you honest.

= writing =

* http://betterexplained.com/articles/a-visual-guide-to-version-control/

= centralized =

* [Subversion] - Tolerable, but you sense that this model has basic problems.
* [CVS]

= distributed =

* http://codeville.org/
* [git]
* [darcs]
* [arch]

= related tools =

* http://vim.sourceforge.net/scripts/script.php?script_id=90
* [TortoiseSVN]