Use a prominent text link or button to encourage the visitor to go deeper into the site and find out how purchasing your product or service can help them even more.
The promised 3 tips to increase site traffic should whet the appetite of visitors and make them want even more great information. This is where you include what marketing professionals term the "call to action."
Something like: "Learn even more search engine secrets with Search Engine Power Pack!" That link would take visitors to the full Power Pack information and subscription page - hopefully resulting in a number of new customers.

Keep a consistent look and feel. Visitors should never click on a page in your site and wonder: "Where am I?" Use the same look and feel (colours, layout, fonts, images, navigation, etc.) in your ads and landing pages as on the main site pages.
This is particularly important when you're sending out HTML email. Because you can format that anyway you want, it's a great opportunity to emphasise your site's brand and create a visual connection between the ad and the Web site.