After the great disk crash, sourceforge changed all the project names.
In each case you need to start over (i.e. recheckout) the project with
the project name at the start. In snd it's:
cvs -d:pserver:anonymous at snd.cvs.sourceforge.net:/cvsroot/snd login
cvs -z3 -d:pserver:anonymous at snd.cvs.sourceforge.net:/cvsroot/snd co cvs-snd