I'm actually trying to get back into some Amazon affiliate marketing, after my failed attempt a few years ago with setting up an e-commerce store selling horror DVDs (which was basically all linking to Amazon pages for those DVDs). This time around I've done a lot more research, and I'm armed with a lot more software and Wordpress plugins and themes to help me build a much more substantial site.
The thing with Amazon that's particularly appealing is that you can get commissions from other purchases a user makes, simply because you referred them to Amazon in some window of time. So if your site is about kitchen appliances, and they click through on a link from your site about a cheese grater for sale on Amazon for like $15, and that user also ends up purchasing a new freezer on there for $700 as well, you get a percent based commission on that freezer sale too. In fact, if they add some products to the cart on Amazon, that cookie window goes up to three months. Though I don't know how it works out if they come back to Amazon from some other affiliate links in the meantime.