Using AdWords to Promote Your Affiliate Links - What is the Policy?

There have been many rumors about using AdWords to promote your affiliate links. Some people say that it is not allowed, and others say that it is. Some say that there is a specific way to do it, and others say that using AdWords to promote your affiliate links is no different from any other AdWords campaign you would run for your own products or services. Some say it works, others say it doesn