If you want to understand why SEO based on links is about to go the way of the dodo, why Siri is Apple’s ace in the hole for far more than just selling phones, and why Google+ is not a social network, you’ll want to read Ed’s post. To quote Mr. Dale himself:
I’m declaring something a Game Changer.
It will shock you.
Grab a coffee and read this now.
Seriously, read it now.