It's no surprise Unbounce is near the top of this list -- they've actually written the book on creating high-converting landing pages. Although there are lots of amazing things about this landing page, the two that I absolutely love are: 1) The use of a chat window instead of a classic form, and 2) the detailed -- but well packaged -- information below the form.
The first stage in setting up sales funnel reporting is to understand your sales process fully (perhaps using a technique like flowcharting). While sales processes are often quite similar from company-to-company, there can be points of difference depending, for example, on the size of the order and the consequences to the client of making the wrong purchase decision.
Open-ended experimentation. This approach is similar to closed-ended experimentation except that more variations will be added for testing and experimentation will not stop when a winner is found. This method is used by large corporation to dynamically improve their conversion rates and improve user experience. Landing page can also be adjusted dynamically as the experiment results change to further enhance user experience.