Google I/O 2011 Opening Day Summary: Google’s famous developer conference - Google I/O 2011 - ushered 5,000 attendees into San Francisco’s Moscone Center on Tuesday, May 10 at 9am. By Violet Blue | May 11, 2011 -- 03:21 GMT (20:21 PDT) Follow @violetblue Previous | Next Image 1 of 21 Google I/O 2011 Keynote, Mike Cleron, Android Team. See Violet Blue's Opening Day at Google I/O 2011 Topic: Software Development Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.