If you do not know who Guy Kawasaki is -- you should. Guy was one of the original employees at Apple and later created the "product evangelist" position employed by many technology and consumer products companies.
But more importantly, he is a highly intelligent, well connected and very tech savvy. His blog is full of interesting features of the web, interesting new views on the world, technology, behavior, etc, etc, etc.
It is very cool and I highly recommend that you bookmark it.
This week he has an interesting entry about behavior called The Effort Effect. Whether you are an employee, manager, parent, student, you will want to check it out here.