Many people are getting involved with CPA Marketing.  It is different from other types of affiliate marketing.  Instead of getting paid per sale, you are getting paid per action.  CPA stands for cost per action.

An example of a CPA offer is an email submit.  If a customer visits the sales page and submits their email address, you already get paid.  It doesn't matter what the customer does after they submit their email, you get paid the same amount.  The commission for each of these email submits is anywhere from $1 to $3. 

You can drive traffic to these offers with PPC marketing, seo, email marketing, and other options.  Certain types of marketing are allowed for certain offers.

There are other offers that pay up to $200 per action.  Of course these require more information from the customers, such as a credit card number or social security number, but just a few conversions a day can equal a very solid income.

The problem with CPA is that many people are jumping in and dumping a lot of money on PPC marketing right away.  This is not a skill that can be learned overnight.  Proper testing and research should be done before diving in.