Tickets to Google I/O went on sale this morning at 7AM PDT and promptly sold out, despite the doubling in registration price to $900 for general admission and efforts to make the event more exclusive. The popular developer event has grown up over the years, and has become the company's premiere showcase for its upcoming products — and this year Google extended the conference, which will take place from June 27th to 29th at the Moscone Center in San Fransisco, to accomodate additional sessions and more collaboration between attendees. For comparison's sake, Google says it took 90 days to sell out I/O 2009, 50 days to sell out I/O 2010, and 59 minutes to sell out I/O in 2011 — this year, Google says that the event sold out in just over 20 minutes.

Update: Google's Vic Gundotra says that this year's I/O conference sold out in record time, with 6,250 queries per second hitting its servers at 7:01AM. Gundotra acknowledges that "it can be very disappointing and frustrating when an event sells out this quickly," and says that Google will stream the keynote and all key sessions live, and provide all session videos after 24 hours. Additionally, he says that Google I/O Extended will hold free viewing parties worldwide, which you can find here.