Google's notoriously generous at developer events, tossing out free devices like candy on Halloween, but here at the Game Developer Conference in San Francisco it's letting them flow like wine. Each attendee at Google's Web Developer Day yesterday got a free Cr-48 laptop , and today the company dished out even greater prizes -- either a free Motorola Xoom tablet or a Nexus S smartphone to every soul listening to some exceedingly well-attended technical sessions on Android. That's certainly one way to attract game developers to your platform.