How do I get started with affiliate marketing?

It's one of those modern business questions that never seemed relevant until the last few years: how do you learn which of the many different affiliate marketing (commission-only sales) programs offer the best payout and opportunity to monetize your blog or web site traffic? After having attended a huge trade show focused on just this topic (the Affiliate Summit in Las Vegas earlier this month) I have some new ideas on how to accomplish this task:

  Get Started with Affiliate Marketing

What kind of success are you seeing with your own affiliate programs?