While the A/B testing content is interesting as well, this is also a good example of how to get your product onto authority sites (solve a problem for them, such as their lack of authoritatively presented content about an area you're expert in) and an example of how you can grow your market via out-teaching the competition.

Anyone ever wondered how you compete with a competitor who has more money than God and gives the product away for free? This is one way. (Clocking the competition in product quality is also an option. In this case, a surprisingly achievable option. Every time I show off Visual Website Optimizer it knocks socks off versus the product from the big ad company.)