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The NewBB2 currently provides API of "getForumList" for other modules to link with NewBB2, both news and wfsection modules have implemented this feature.
It's not hard to build a more comprehensive NewBBAPI class by which you can simply add your conent to newbb by:
$NewBBLink =NewBBAPI::addPost($NewBBForum,$YourTitle,$YourAuthor,$YourContent,$YourTrackback);