Google is yet again adding to its ever growing list of services -- but the latest product in the works makes a lot of sense. The search giant is working on a niche search engine that will help cellphone users find ringtones, games, and other mobile content.

Google already provides a version of its internet search engine optimized for mobile devices with smaller screens and slower internet connections.

The new product could be a major money maker for Google. Cellphone users spend billions of dollars on phones, service, and content. Google will provide links for you to download and buy mobile goods like ringtones, wallpapers, and games. The company will charge content providers a fee for placing links at the top of a search results page, much the way it does with its regular search engine. Of course, that kind of placement could be even more valuable with the limited real estate on most mobile screens.