I've contributed to English Wiktionary, English Wikibooks, English Wikisource, and probably others, and have non-trivial userpages on Commons and Simple English Wikipedia.
As an Australian, I favour Commonwealth spelling. But I'm generally all for a balance of power on Wikipedia. Individual articles should be consistently one or the other, except where specific instances call for a change within an article. I revert edits made to Americanise (and, I suppose, Briticise, if I ever came across one) an article without any justification (like consistency).
Actually, I'd like to see Angr's Unified English Spelling adopted, but hey...
I've been thinking about the reliability problem of Wikipedia, and I think expert review is the best chance we have for making subjects reliable. My means would look something like this:
Nothing in particular. I used to watch my watchlist like a hawk, but no longer.
I have had a past professional connection with Westnet. Though I have made edits to that article, doing so was and is in no way related to any professional duties I had.