I've spent the summer building an ad system. It's called Texsy Ads, and it automatically highlights product mentions on a website.
It's kinda like a cross between IntelliTXT and Chitika.
Here's an example: Some things I want for Christmas:
Mouse over the links above to see the ads.
Texsy automatically underlines those "product-y" phrases, and creates a mouseover ad with related products & prices. The ad clicks are connected to the Amazon, Ebay and Shopping.com affiliate programs.
Any website can use it. The revenue split is 80% for the publisher, 20% for Texsy. You get paid via your affiliate account (i.e. Amazon, Ebay & Shopping.com send you checks).
I think Texsy Ads will be good for sites that mention products like:
Check it out at: http://www.texsy.com. It's in Beta, so I'm looking for feedback as well.