How Would You Market A Book?

We're approaching a new phase in getting The Art of Explanation into the world. Now that the writing is 99% done, we need to think about marketing and promotion. Soon I will have a meeting with Wiley (the publisher) and start putting together a marketing plan. In preparation for this phase, I hope to learn as much as I can.

I would love your help.  If you have written/promoted a book, worked in publishing, marketing, PR, or simply have ideas, I'd love to hear your thoughts. I am a first time author and The Art of Explanation is aimed at professionals and the business/communication category.

How would you market the Art of Explanation?  What tools and resources are most helpful?