I'd like the non-registered users not be able to use XHTML or post links at all, although they can type them in they just wont be hyperlinks
a even better idea might be to only allow registered users with 10posts or so allowed to post a link, by then i might trust them (maybe they can make one of those security images so bots dont register later on)
also where do we edit what XHTML tags we want available?
You can edit what tags are allowed in /conf/_formatting.php