Yoddle Relations is a ppc service similar to Googles Adwords. You can give it a try using this code:
Code:
<script src="http://www.yoddle.net/cgi-bin/relations/include.cgi?keywords=<<KEYWORDS>>&external=1&java=1"></script>
You will need to replace <<KEYWORDS>> with the keyword or phrase that you require. This can be automated in dynamic sites using any number of values. The difference between Yoddle Relations and Googles Adwords is that the power is with the webmaster. You can play with different keywords and or phrases until you get the perfect match to your content. No more unrelevant text ads with your content. Play around with it and give me some feedback. I will soon be opening this up to affiliates so that you can make money with the code.