After realizing just how many links to Amazon I had on the site, I decided to join their referral program. So if anyone clicks on a DVD, CD, or Book I have listed, and eventually purchases it from Amazon, I receive a small referral fee. The same is true if you click the Amazon.com banner at the bottom of the page and end up purchasing something.
I don’t expect much to come of this, but maybe after a few years I’ll get a $5 gift certificate or something.