Actually, we do have plans to use vbulletin3 but I am waiting until it gets out of beta and I have some free time.

I have been planning to use that version for over a year and have been waiting, waiting, waiting while they work on it. Since the rest of the site hinges on vbulletin, it is not a quick install, but more of an integration, so I haven't done a vb2 upgrade in the interim.

So...stay tuned I guess.