Chartreuse has some interesting ideas about living on the edge: it’s not what’s the obvious that’s important, but what is at the edge. Chartreuse says:

Google’s value isn’t it’s search engine.
Flickr’s value isn’t in uploading photos.
Just like your value isn’t in what you do
It’s in who you are.

For more ideas on edge competencies, see http://www.bubblegeneration.com/2006/01/edge-competencies-what-do-googles-use.cfm