I think the best way to promote affilate programs is to do them indirectly. A lot of the products that I have purchased over the years teaches you how to do this.

Of course if you do decide to promote the page directly Traffic Exchanges are always a good option. You have to do some work there though so it is up to you. I don't have any experience with webrings but I do know I have had some success using the Get Paid to Read sites when it comes to driving traffic to my website for low cost.