I use adsense for search, it contributes for less than 5% of total earnings, search box is something visitors would like.
I have integrated adsense search to my wordpress page so it look like its a part of my site rather than a different page for search results from google check it here : http://www.saijogeorge.com Tutorial to do this yourself : http://www.saijogeorge.com/2008/10/03/google-adsense-search-integration-in-to-wordpress.html
For my blog, no body ever use this search, only Adsense content generated clicks. But no harm to put it in your blog as it didn't occupy large space.
I have used it. BUt the revenue wasn't that good. Infect the whole adsense didn't turn out to be a good experience. Its alot of work and less return.
There's a way to increase it without violating adsense TOS. The last payment I received was $109.13 and only $13.58 came from adsense for content, $95.55 was earned using adsense for search. That's the best clue I can give you by letting you know it's possible.
WoW! This one is really encouraging!!! How did you manage that? could you please share it with us? I have Adsense search on one of my blogs which has got some clicks but has not earned anything to me. I really think that all those who think Adsense Search doesn't earn or it is just waste of pixels should give this a thought. Thanks for the reply!!!
By the Way, here is an article on Adsense Blog: Is it right to search on your own site? What do you think about it?
Yes, I've added adsense search in my blogs and generating lil earnings from it. it only works when your blogs contains lot's of information in it. Cheers,
If my domain name was one of the popular keywords for search engine traffic I wouldn't use Adsense for search on that site it.
The result of revenue from search are very low but it will help our vistor to find some information which is not in our website or blog.
It pays very well, in fact click-per-click it pays much better than Ad Units. The problem is that the overall number of searches is much less. Possibly because I have the search boxes placed quite unobtrusively at the bottom of the page. For me it amounts to about 1% of my overall earnings, but if I got rid of it I'd be turning down quite a few dollars a month so it's worth having there.
Sharing this to everyone will just increase my competitors. The more competitors will lead to less revenue. It's just very simple method but powerfull. I'll share it if you consider donating.