Where you place your affiliate links on your website can really make a difference on how many clicks you end up getting and, since every click means a potential sale, this is an important aspect of internet marketing.
Research has shown that the most effective affiliate links are text links. Yes, plain text links. Not big flashy banner ads like most affiliate website are filled to the brim with. What happens is, you write a great article (or have one created) about the product or something related to the product and stick the link into your text. This allows interested readers to see the link as they are reading and click on it.
Of course, your article and your link have to work effectively together to make this happen. A bad article and an unrelated link to an unknown product are not likely to make the profits roll in.
So the next time you are out to choose an affiliate link, try placing a relevant link in a great article that is well optimized for search engines and see how it works out for you.