If you're into planning and saving the date, Google would like to let you know that Google I/O, Google's largest developer conference, will be returning to the Moscone Center in San Francisco, CA on May 19-20, 2010. There's not much you can do for the event now, considering early registration starts in January 2010, but consider our calendars marked. Google I/O 2009 was the event where they gave free Google Ions aka HTC Magics aka myTouch 3Gs to attendees and introduced Google Wave. What will be in store for 2010?