One of the ways to be successful as an affiliate marketer is to always look for new and exciting programs. Two things to look at are the percent commission, and how well the products are received in the marketplace.
Here is a link to an article I wrote which details two new programs that I have recently found:
http://www.associatedcontent.com/article/114904/two_affiliate_programs_to_expand_your.html
Don't be afraid to ditch programs that are not paying well, and add new ones with higher commission rates and better products!