Like a politician canvassing the country for votes or a cheerleader vying for Miss Popularity, your opt-in message needs to be everywhere at once-- on your home page, navigation menus, graphic images, landing pages, registration forms and even shopping carts. The goal? To collect subscribes at every place that your site touches users.

Here’s how AbeBooks does it right on a rare books landing page.

I asked Chris Burdge, AbeBooks' marketing manager, how his everywhere-at-once strategy is paying off. He says, "AbeBooks is continually testing and optimizing tactics to grow our lists with high-quality subscribers. The most recent tests resulted in a 137 percent increase in subscribers."