Share 'Deleting from the Content Store'

Hi guys, I'm having problems working out how to delete something from the Content Store. I found this link: http://pastie.textmate.org/126735 That is supposed to delete an object. But it does nothing. If I try a print_r, the $content variable has the right bits, but the executed tagQuery is empty. How's that happened? For reference, I'm trying to delete a message board category. I know it's s…