I jokingly refer to myself professionally as the Frog Pond using the analogy of a Boston Landmark (http://bostonfrogpond.com/) - I cover a lot of ground, but I'm not very deep. I used to be an expert in one language or tool or another, but that's not really the goal of my work in community and developer relations...and I'm perfectly ok with that. I enjoy learning, and positions like yours and mine offer an incredible amount of learning opportunities, even if we're never the deepest experts we once were.