Yup. I'm on the University of Washington campus right now with my (sadly empty) Blackhawk Serpa. I haven't seen anyone else doing it yet, and really it doesn't seem like anybody has taken any notice (with the single exception of one of those Lyndon LaRouche nutjobs, who said as I walked past: "you look like a particularly feisty patriot." I took it as a compliment despite the source ).
So, pretty quiet, all in all. Maybe I should've been wearing a pink holster. :P