Making email messages more personal is almost always leading to higher attention and conversion.
Embed in your HTML emails an auto play audio file that is a greeting customized to the receipt’s name. Something like “Hi John. I hope you are using the last tip I sent you. Read this to get even better results.”
Instead of showing each visitor the same testimonials, make them load dynamically based on the visitor himself.
The more you know about the visitor, the better you can show him the right testimonial. Even if you don’t know much, you can simply ask him what’s his main objection in a pop-up window listing the major ones. He just has to click on the one mostly on his mind. Based on the information you can dynamically load the testimonials in which your customer is telling their story and answering that exact objection the visitor has.
You are more likely to take notice if the ad is calling out to you and your specific needs and wants.
Recognize the driver (by the car’s license plate, his mobile phone’s position, etc.) and display a personalized ad on the billboard.