does rob davis only do workshops?

No.  In fact, Rob Davis does Keynote presentations, individual consultations and customized workshops for companies wanting to do something in-house.

how does "who do you know?™" differ from networking or referral systems?

"Who Do You Know?"™ is a system designed specifically for the small business owner or someone like an agent for a company that actually operates like a small business owner.  It's more than just letting people get to know you and what you offer, which is important, it's about getting people to "go out of their way" to recommend you.

When will the book be available?

The manuscript is being completed now and the book has a target release date of Fall 2006.

Why is Who Do You Know?™ about principles instead of strategies or techniques?

Strategies and techniques are the kinds of things that you would use to improve something like your golf game.  In other words, you would take those same strategies and techniques and apply them to bicycle racing.

Principles, however, cross almost all boundaries and can be applied in many different areas.  Principles provide the Why? behind every What?.