Ok, here goes:

1) Sticky: Nokia closed their bug tracker but you can still vote and comment
this is a "lost" case

2) MeeGo-Harmattan HE
last message from May, and most of the links towards nokia.com are incorrect now

3) Renaming "Maemo 6" to MeeGo / Harmattan
also too old and everything that comes with it, to be sticky

4) others are about adapting MeeGo (Harmattan) to N800 or N900. I can't be competent about this but I don't see any activity.

How about just leaving [F.A.Q.] List of harmattan terminal warnings and errors - thread to be sticky?