The economist.com has a great story on innovation from the perspective of Evan Williams, founder of blogger and twitter. In it he says there are 3 rules to innovation

1. Genuinely new ideas are stumbled upon
2. New Ideas are by definition hard to explain to others.
3. The idea seems obvious in hindsight.

This is exactly right I think. I try to explain blogging, podcasting, and social media to people and I get blank stares. Sure others are explaining it as well but they have more success then I. For me it is in the enterprise that I have the blank stares. If I talk with friends and collogues it is a different story.