Wireless Leiden uses Subversion as its version control system.
The Subversion homepage, including documentation on how to use it: http://subversion.tigris.org/
The repository itself: http://svn.wirelessleiden.nl/svn/
An RSS feed of the commits: http://svn.wirelessleiden.nl/svn.rss
A ViewVC view of the repository: http://svn.wirelessleiden.nl/cgi-bin/viewvc.cgi
There is a wiki-page about tortoise, a svn-client for Windows users
There is also a wiki-help-page SVN_Layout and a mini-HowTo