actually you search in the languages in phrases for "powered by"
you'll see
{1} - Powered by vBulletin
then you'll remove everything but the
{1}
but actaully that doesn't even matter if you have that "force read this thread" hack installed,, the bots don't even see your forums by the results I posted above
btw.. your site does look sharp

it looks like your members really enjoy the place and the blog