In the category 'nice to know':
I made a script to measure who is most involved in public mailing lists discussions, and on which lists.
You'll find a complete list of mailing lists and how their activy changed over time http://www.infodisiac.com/Wikipedia/ScanMail/
For each list you'll find a breakdown of posts by author, with board activity added separately, e.g. for the foundation list http://www.infodisiac.com/Wikipedia/ScanMail/foundation-l.html
Powerposters get their own page (*). They are all combined at http://www.infodisiac.com/Wikipedia/ScanMail/_PowerPosters.html
Overall board activy on public mailing lists has not significantly decreased over time http://www.infodisiac.com/Wikipedia/ScanMail/Board.html Most change of activity can be alluded to less board posts on technical lists.
Caveat: be careful with interpretations.
1 Please don't confuse number of posts of a person with relevance of that person's contributions. Less may be more in some cases. 2 People who seem less active may be very active on private mailing lists. 3 Lists that are hardly active may have a private couterpart. 4 People may have posted with different names, some are already interpreted as aliasses, but probably some not yet. 5 Over time the character of some lists may have evolved as new more specialized lists were introduced. 6 There is no strict separation between lists. Non technical lists will contain technical discussions from time to time.
These stats are autoupdated daily.
By the way, I hope to refresh wikistats as soon as a reasonably complete set of new downloads is available, with most major wikipedias included. http://download.wikimedia.org/
Erik Zachte
* Known bug: for some powerposters with special chars in their name their own page is not linked properly. ------------------------------------------------------------- Unrelated: Delphine pointed out my posts break mail threads. That was not on purpose e.g. to draw attention. I follow lists through pipermail and copy/paste texts I quote. I'll subscribe to mail, and reply in orderly fashion.