I would like to draft a general (optional!) user survey, to offer in sections to users who want to fill it out. What do you think? Take a look at the current survey questions and comment.
I seem to recall a number of smaller surveys have been run in the past; if you have taken part in (or run) one of these, please link the surveys to one another, or perhaps create a category for them...
http://en.wikipedia.org/wiki/User:Sj/Survey/draft (I know it's in my user space, but feel free to edit this page mercilessly.)