Matt Thompson just wrote a fantastic post over at SM. Here's the end of it:
What I’m trying to say is don’t sit around waiting for the next Margaret Mead. And anthropology doesn’t become more relevant to Jose Six-pack once we cross Marshall Sahlins with Marshall Mathers. We can all be public intellectuals of a local, non-celebrity sort. Find something where you are, some way to play a role however small and do it. It doesn’t have to be hard. You don’t have to write a grant. Just share what you know and what you do with the people around you. Let public anthropology be fast, cheap, and out of control.
Now, go read the beginning and middle, here.