There is also the fact that most of us don't know how to learn efficiently. For example, how many of us really know the current theories of memory and how we may exploit it to enhance our learning?
Also, a lot of stuff here: http://www.columbia.edu/~nvg1/Wickelgren/
But what may have influenced my life the most is this book: http://www.amazon.com/Your-Memory-How-Works-Improve/dp/15692...
I for one am convinced that the next frontier is our mind. Information is free - it's your ability to digest it that's the bottleneck. Also, we don't really know a lot about how skills such as creativity, hypothesizing patterns from specific examples, etc. can be systematically learned.