blog + wiki = bliki
The concept is originally first implemented in REBOL, and use in langreiter.com.
this is very close to what I'm looking for.
blog + wiki + webboard .. and may be messaging and calendar system, everything on a single platform -- no multiple log-in hassles. Also keep content away from presentation; and makes it easy to add content, encouraging people to contributes.
If you know one, tell me.