From SO Media:
The generated ads are not obvious or blatant and can command a much higher click thru rate than regular PPC (pay-per-click) ads.
Can be used with any form of content such as blogs, forums, article sites, public domain material or online books.
Doesn't require any special knowledge or skill and can be live on your website within minutes.
Links open up in a new browser window, keeping your visitors on your site so they get the chance to return, click more ads and earn you more revenue.
Can be combined with any other PPC advertising programs you use (The more income streams your sites have, the better)
The links will appear exactly like any other link on your website. If you use style sheets they will follow the same format set out inside it.
Covertly converts the keywords into links without actually modifying the pages source. The links are created 'on the fly' the second a visitor lands on the page.
Protects your websites search engine position and link popularity by covertly disguising every link it creates. The search engines wont know your site has a bunch of affiliate links pointing out, so it will rank higher.
Tested to work in any browser, so you know everyone who visits your site is seeing and clicking on your new cash generating affiliate links.
Compatible with any webpage regardless of the language its coded in. Works with html, php, asp and anything else.
No complicated modifications to your website required. Just insert one snippet of code and your done.