Psst… If you don’t mind doing a Thunderbird-specific one that I myself wrote up at the end-Oct 07, you can still do so by the way. But while mine’s not official, (and probably not done up as well since it’s a one-man operation) there will still be results coming up, along with an analysis done up by me. –not so soon though; my next week at university is packed!
Btw, the number of complete responses has rose past 625. And oh, the survey I did up, was just for fun; it does not help me in any of my homework now at all, be they projects or papers, none whatsoever.
Edit: The survey has been closed as of ~1pm UTC on 18 Nov 07. It has ~689 complete responses, and exactly 1,000 if partial ones are included.