This past season, I did virtually all my shopping on Amazon. They make it so simple, don't they? Just when you are wondering what is the wholesale formula to buy for that impossible-to-buy-for person, they show up in your email box with a helpful reminder. When you don't like what they are suggesting, that's okay - they will suggest products that other people liked.
It is a genius business model. They draw you farther and farther into the world of theirs, get increasingly more information about you until they understand you better than you understand yourself. Due to this smart, top-of-mind model, they've made billions.
Believe it or not, you can apply several of those same concepts to your own direct mail marketing.

Understand your customer.
Be ubiquitous.
Acquire a smile.

While the business of yours might not exactly have the business of delivering books and music, you are able to still have a couple of pages from the Amazon playbook and see real achievement.