Nice photo. It's a pika (more info here: http://www.summitpost.org/album/267305/pikas-and-other-lagomorphs.html )
I wasn't sure at first, since in this picture I couldn't see the striped tail that I've seen on other ones.
She is definitely giving you the once-over though! Cute photo!
Most of the pikas ran off when they spotted us, but this one was a little bit more brave. Maybe someone fed her in the past.