"First, do closed-loop marketing tracking. It's not enough to know how many leads you're getting from each lead source; you have to know how many customers you're getting. Second, you should track everything: every email, every link, and every email signature should have a tracking URL on it. And finally, you should test constantly. Your market is changing, your message is changing, your competitors are changing, and your product is changing. You're never done testing."

- Dan Dunn