After getting some strange results from AdSense (Google!!), was just thinking for trying some other online advertisement company, and two days research completes at the doorstep of AdBrite.
Doesnt seem, the company has contextual ads but still wanted to give a try.
If you also want to give it a try on your website, have a look on the right panel bottom side, you will find the link to become member there.
Let's see how it works out !!!