I saw earlier this week other specific ads for digitalpoint, actually a good idea to target a specific audience. It's regulated via adwords, see also http://services.google.com/ads_inquiry/sitetarget
I was declined by Chitika because I didn't meet their traffic quantity That was one site and I have not tried again, working on some projects before I do.
Its fairly new and as of now the payout is quite good...Also if you use it in a non-contextual mode it can be on the same page as AdSense They also have an affiliate program where you earn 10% on the accounts you sign up (of Chikita's end) so there are a lot of people posting about it for that reason
I investigated who is the wonderful smart webmaster who runs that adwords campaign. http://forums.digitalpoint.com/member.php?u=11714 Thanks Merkersarl, me too started using chitika! ( Yay! )