The source code repository on Sourceforge has been ported across to Subversion. This should provide a bit more flexibility in how the code is managed, plus was an opportunity to re-organise some of the projects.
Due to failure to find an easy way to port across the history information in my 30 seconds of searching (I'm sure there used to be a button to do this), all history has been lost, but it is still available in the CVS tree.
The easiest way to view the subversion contents is to simply browse to http://yagsbook.svn.sourceforge.net/viewvc/yagsbook/trunk/
Alternatively, you can check out a read only version of it with the subversion tool, using (in Linux):
svn co https://yagsbook.svn.sourceforge.net/svnroot/yagsbook/trunk
Other clients may vary in their usage.