A page or notice on your website or blog that makes your site visitors aware if you are being paid or compensated (via affiliate marketing or any other methods) for any purchasing recommendations or product or service endorsements you make on your site. A disclosure is required if you're doing affiliate marketing to be in accordance with FTC laws. You'll find more on that here.
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.