The actual wording in the top-right of the titlebar (below the monk pictures) says "Perl Monks", not "Perlmonks". It would quite permissible to give the page a title including "Perl Monks" as two words - I think that's what Vroom probably meant all along.

The search-engines-versus-GET-variables thing is a failry deep problem with Everything. I wonder how hard it would be to get the engine to understand /-delimited fields? Default behaviour for most webservers is to serve the request for the first existing file in the request path, even if there are other trailing components. So we could go to http://perlmonks.org/index.pl/node_id=51515/lastnode_id=09876 and Gooogle would happily index it.