My tip to beginning affiliate marketers is to focus more on demographic targeting than keyword targeting and destroy the content network. Here is an example and the steps on how to do it:
1. Pick an offer from Market Leverage
2. Determine the target demographic for that offer (extra tip: Use Quantcast.com, it is awesome and free!)
3. Create your keyword list around things that interest the demographic, not just the obvious keywords.

Example:
We are going to be promoting Market Leverage offer 4648, Liftsp Facelift stuff... We go to Quantcast.com and enter the url of the offer, www.yourownperfectface.com. This gives us a ton of information about the target demographic. Based on a quick review, we will be targeting women from 18-49. Based on this, we can start looking for sites that target women in this demo and have adsense so we can target those sites specifically through the Google content network. Dont look for skin sites, think outside the box... Pregnancy websites, weight loss websites, cooking websites, wedding websites, etc...