I have found some of the suggestions for increasing participation strange. Wikipedia is not a MMORG, it is not a social networking site, it is not a file/picture/video hosting service, it is an online encyclopedia. Some people like the first three. However trying to turn Wikipedia into a combination of them is not how we go about writing an encyclopedia. We need to attract people who are interested in writing an encyclopedia and need to drive away / direct to the appropriate venue those who are looking for something different.
My suggestion for increasing editor numbers would be to promote Wikipedia at Universities. McGill has a Wikipedia club. Promoting the formation of clubs at other Universities would have a positive influence. Currently most University students are female ( about 55% ) http://www.universityworldnews.com/article.php?story=20091023110831548 however Asperger syndrome occurs 5 times more frequently in males than females. This might have something to do with the gender ratio we see. :-)