Hugh Macleod the cartoonist who illustrated Kim's presentation at the Open Source Business Conference has his own take on Open Source - one I had never really thought of.
Metaphorically, imagine your market was a human body. Now imagine a human body that doesn't need vital organs in order to survive.
If you can imagine that, then that begs the question:
"Why pay a corporation for an expensive pair of lungs, when you can millions of microlungs for free?"
He has a great picture to illistrate the point on his blog.