Using Other Ads besides Adsense

One other thing that I've been working on lately is using ads in addition to Google Adsense. Many vendors have what's called an affiliate program and when you sign up with a centrally managed site, you can access to various ads. The incentives vary but a t-shirt company, for example, may offer 15% of the sale. The main sites that could find [that provide the management of the affiliate program] are Commission Junction, Performics, and ShareASale. Some of the commissions are quite significant. I've tried to target my ads to the type of website or blog that I have but honeslty, I have had little luck thus far.