When I'm asked "what do you do?" (or worse, "what are you?") I sometimes don't quite know how to answer. Usually the questioner is actually asking what my current job is, so sometimes I'll give them a break and answer that question instead.
But if I have to fill out a form, or describe myself, I'll usually say that I'm an Ethnographer. (Which, by the way, chicks dig.)
I don't know where I came across the link to this Wiki, but I'm very happy to add it to my bookmarks. Take a peek: Guide To Ethnography