Google Android engineer Mike Cleron talked during the keynote about having "one operating system that runs everywhere," but Google officials declined to say whether that indicates anything about the future of Google's less well-known operating system. Chrome OS runs the Chrome browser on top of Linux, and assumes that users will do nearly all of their computing on the Web. Google has promised to deliver Chrome OS laptops by the middle of 2011.

Chrome and Chrome OS will get more attention on Wednesday at Google I/O, but it was all Android Tuesday. Google helped Samsung hype the upcoming Galaxy Tab 10.1 by giving the device away to all 5,000 or so attendees.

Life at Google:

While Google boasted of 100 million Android device activations, it has a long way to go before it can topple Apple's iPad on the tablet front. Google I/O attendee Kalman Lee, a Web developer for Demand Media in Santa Monica, has faith in Android.

"With the iPhone, it took a few years but Android caught up. I think tablets will go the same way," he said.