Try now. I had deleted a bunch of older files at the request of SourceForge. I'm not sure why this would have affected the documentation. I've updated the docs to point to the correct place. I'm not sure if there is an automated process that may cause things to go awry again. I'll continue to look at this for the next few days to make sure things remain stable. Thank you for reporting this!
Yes, you should be able to do the following to extract the source. cvs -z3 -d:pserver:anonymous@staf.cvs.sourceforge.net:/cvsroot/staf co -P src