What could be done to increase the number of active contributors to the projects?

One simple way to make it clearer that you can edit a page is to make the edit button bigger and to change its color.

More importantly, if you're going to be making any sorts of changes with these goals in my mind, you need to have a framework where you can experiment with changes like this and experiment to see if they actually work.

Eekim20:33, 25 November 2009