There was a tech question in one of the bigger motorcycle magazines about this topic last month or this month, I forget when. Anyhow, the question was something like , "Can you damage an engine by over-revving it in nuetral (without a load on the engine)?" The answer was a definite no. They said you could rev an engine all day long in neutral without causing any damage. So, don't sweat it. We all do the nice miss-shift from first to second over-rev move. It's embarrasing as hell, but it happens to everyone. just don't worry about damaging the engine. You should, however, wait until the engine speed slows down before you shove it into gear again.