General comments - you should contact Dave Bauer as he's working on it for OpenACS 5.0/2.0. The changes are significant so he's been working in contrib, but the plan is to fold it back into the mainstream.
acs-lang: talk to Collaboraid (Lars/Peter)
bboard: we plan to make this package disappear before long so I'm not sure it's worth our taking your localized version. The datamodel and much of the code is *horrible*. Forums needs work but is much more sound as a base for improvement.
user management: you should probably talk to Collaboraid ...
Maybe the categories package should go in "contrib"? Or maybe folks would like to review it? Not sure ...
All of this needs to work with 9i since we're going to officially support 9i with 5.0. Also ... is this all working in Postgres, too?