First you need to decide if the site is going to be dedicated to all of vBulletin or just the security aspect of vb. To be honest, there are already way too many "vb groupie" sites but none that I know of that are solely dedicated to the security side of things.
yeah, I will start thinking about that but I still haven't heard back from vbulletin.com
A site dedicated to the security of vBulletin is kinda of...umm pointless? Isn't vBulletin extremely secure by default, so I really don't see many topics being discussed.