Between my install of Boa on Fedora 8 and today’s install of Boa “boa-0.94.14-0.10.rc21.fc9 (i386)” in Fedora 10 a bug was introduced into the /etc/boa.conf file.  At some point they changed the location of the /srv/www/boa directory to /var/www/boa.  They forgot to update the ScriptAlias value in /etc/boa.conf.  Just change the svn in the path to var and then restart boa.  CGI scripts in that location will start working again.