Android and iPhone developers looking for an extra source of revenue will soon have an advertising option, sponsored by Google.

Google's AdSense program--in which it sells and distributes ads to third-party publishers--is coming to mobile devices as a beta program, the company announced Wednesday. A small group of developers have been testing this program but now anyone can apply, said Susan Wojcicki, vice president of product management, in a blog post.

Mobile apps are one of the hottest top...

And Google's ability to walk away from high-cost AdSense deals are one reason those margins are headed higher. Lindsay writes in a ...