YouTube was evaluated three years ago at 600 million. Google paid 1 billion. Was it out of line? Three years in and YouTube is beginning to have some revenue models, but the jury is still out on whether the value was overshot. But one can't underestimate the "big picture" thinking of Google.
Speaking of Google, there has been much fuss this week over Streetview. Google has sent teams of cars to cities around the world to photograph them from every angle. Your house is most likely available to view. Some find it invasive. Tour operators are looking at it as a huge opportunity, giving people the chance to have a glimpse of where they'd like to go.