BozMo mainly contributes on Wikipedia although the email from this site works. I am a sysop on en (if that means anything to anyone) but my main contribution to the project has been the development of the offline Schools Wikipedia for schools in Africa without reliable internet connectivity. And yes, I know, an update is long overdue and I get several messages a week asking me to get on and do the next release (which I will soon).
I do use wikiquote quite a bit but I do not often edit it. That's probably a good thing because I am not accurate enough with exact words; my memory seems to work on concepts and I have to look around to find the accurate wording (hence I come here). Enough chatter..