I have a client who is advertising on Google Adwords (Content Network) and making money with Google Adsense. He has 50,000 keywords in his adwords account.

The idea is to advertise the keywords at low price and earn money when people click on the adsense ads. The Adsense CTR is 50% - 55%.

Now most of the highly clicked keywords are not generating enough money to support their spendings. So we have to pause them.

So I think of replacing Google Adsense with some other Contextual Ads or PPC Search Results for such keywords - to make them profitable.

Can you suggest me any program good enough to replace Google Adsense.

Clicksor rejected my site and SearchFeed is not at all profitable (pays max $0.05/click)

I found these on the internet. I have not applied for them yet. Anyone tried any of these.

ValueClickMedia
Chitika
eBay Ads
Kontera
AdBrite
Miva
Bidvertiser
RevenuePilot
Fastclick text ads
AdSymphony
7Search.com
Search123.com
AdSymphony
Tacoda
Kanoodle
Burst Media
Vibrant Media

Thanks