A while back I talked about how you can use the Amazon Affiliate Program to earn a commission from referring customers to Amazon. That's a pretty great program, but sometimes Amazon might not be the right fit for your needs as an affiliate. Many other companies with online stores have affiliate programs, but it can be a hassle finding all the different programs and setting up accounts.
If you want to try out more affiliate marketing opportunities but you're overwhelmed by all the options, you should give the Google Affiliate Network a try. The Google Affiliate Network is basically just a platform that helps connect advertisers with content providers. You just create an account and you'll have instant access to hundreds of different affiliate programs. You'll need to apply to each individual company's affiliate program, but once accepted, you manage your affiliate relationships with all the companies through Google's web interface which is much better than having to log in to a bunch of different accounts.
There are a lot of great advantages to using the Google Affiliate Network, so if you are interested in making money through advertising, I strongly recommend that you check it out for yourself.