[Fraik]

This has worked great for my news system

What it does, is give forum users an account on wordpress (you can determine which group you want to take on which role). Comments can be handled either by wordpress or by the forum, whichever you want. If you want it to be on the forums (like me) it will automatically post a thread, to which your users can reply.

I love this plugin as it allows me to use all the great features of the WP posting tool like pinging other sites, category and tag archives etc. - while I can still use vBulletin to handle discussions and comments. I used vbExternal before, but this is much more stable in regard to converting HTML -> BBcode