Thanks everyone, I figured that everyone would look at average speed differently so wanted to get an idea how others use it as a metric. IndySteel your point is well taken. My trainer has already brought that up and encouraged me to just focus on a very moderate increase in 2011 - just try to bring my average speed up to 14-15, though speed will not be my main focus. I was unsure what would be a reasonable approach to this so I appreciate the comments...

My focus will include searching for that inner hill-climbing beastie and long distance riding and, most important of all, having fun I suspect that a lighter bike, once I have it, will increase my average speed.