UxD is a meaty (or mushy) term to define. You’ve done as well as any, I’d say.

I’ve given it a lot of thought, and while the origins and practical application of the term are quite clear to me now, those tugging at the edges of it, towards the camp their design discipline lives in, do us all a disservice, I think: it is and pretty much always was a user-centric approach to web-based communications/software systems.

I’ve put my name in the ux design definition hat too, after too much thinking about it and finding too little online to my liking:
http://uxdesign.com/ux-defined/

http://www.interaction-design.org/encyclopedia/user_experience_or_ux.html - does a fair job, too, if leaning more the the multidisciplinary side, which I see no point in.

My approach is more casual, as I don’t represent some “serious” professional association, or what have you, with a reputation to protect. But then we shouldn’t take it all too seriously anyway, aside from the actual results, no?

Michael