Google has just introduced AdSense for Mobile Search. Mobile network operators and mobile website owners will be able to embed a Google search box on their mobile portals and web sites.

Whether they are day-dreaming of Hawaii or trying to find the perfect Valentine's day gift, mobile phone users will get instant access to Google search including comprehensive web search, local, image, and news results -- all formatted for their phones. Mobile operators and website owners share in the ad revenue generated by searches originating from their sites.
When you take into account that approx. 38 million people in India currently use their mobiles to access the internet, AdSense for Mobile Search sounds like it might be worth testing out. Note however that AdSense for Mobile Search is currently in beta. If you'd like to take part in beta-testing, you can apply here.