Tracking your advertising is key in any type of advertising campaign. By tracking your advertising you can find out which ad worked better, which ezine pulled the best results, how many sales per campaign, the rate of conversion and other information that is key in testing out advertising campaigns. If you were to know that "Ezine A" gives you a 200% higher rate of return then "Ezine B", which one would you use next time? With tracking your advertising, you will give yourself the information to decide how your advertising is working and where the best places are for your product and ultimately save you money.I like to tell people about a web site called Go2U.Biz because it is a complete URL tracking system that can be used to track URLs through links. One is able to "shorten" a long URL to a URL that has uses go2u.biz.
Another great site and service is YuhKnow.Com which is an email service that is a non-bounce system.