He suggests using tools like Google Website Optimizer and Google Analytics to look at the metrics that matter.

Youve got to know what the conversions youre looking for are though. Some have proven that it is possible to make good money with advertising on blogs, but its not an easy feat. Not everybody can be Darren Rowse. In many cases, its going to be easier to sell a product or service. Brian Clark of Coppyblogger knows a thing or two about this. See what he had to say about it in our interview with him.