Google released a Mobile Playbook, written by Jason Spero, Google’s head of mobile sales and strategy, and Johanna Werther, Google’s Sr. Product Marketing Manager for Mobile Ads. It's a guide to help businesses take advantage of mobile marketing. Of course, it's optimized for viewing on tablets, so I haven't looked at it yet. You can view it online, but I can't wait to get home and read it on my iPad!