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I've always been a fan of Google IO. It is a huge event, full of great announcements. Google goes all in organising a great show and it is tricky to get tickets. You always walked home with the newest gadgets and were the first to learn about new products coming out.
Luke Dary's profile photoAlice Boxhall's profile photoDan Scott's profile photo
First, thanks for showing appreciation for the +Google Developer Groups and organizers. We had a really great global summit the two days before I/O. 

As a front-end guy I agree with your sentiment toward the keynote. I was left excited for the Android folks that they were getting so much attention, but disappointed because there just wasn't much for me. At least a few people made comments about the noticeable absence of AngularJS. You hit on most of the sessions that I would call out as being worthwhile to watch. The +Jake Archibald and +Alex Russell one looking at ServiceWorker is a must watch in my book because it is both humorous and technologically amazing.

There was one session that you didn't list that may be of interest, "How we built Chrome Dev Editor with the Chrome platform", if only because to me it has the potential to make my Chromebook a legitimate web development machine with the potential for direct mobile deployment. The presentation included a demonstration of the "Deploy to Mobile" functionality.
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Additionally, +Alice Boxhall gave a really great sandbox presentation about accessibility in Polymer and web apps. I may not be paying enough attention, but I haven't seen slides or video of it anywhere.
As an organizer, I appreciate the shout-out to GDGs as well, and I think there is plenty of potential overlap with Mozilla communities. I know that when I lead any web-focused session I take pains to do as much as possible with Firefox as well as with Chrome to ensure that we're not painting ourselves into a corner--or at least do so knowingly. And it would be fantastic to bring a FirefoxOS device into the mix!

As for: Do sentences like “I use this all the time to chat with my friends” when announcing a new product that isn’t out yet work? I assumed that that was a genuine statement based on dogfooding within Google. That could be a generous assumption on my part though.

I also agree with the bizarrely ever-worsening logistics; I was relatively early in the keynote line (only one block away from the front instead of five, heh) and managed to arrive just in time for the countdown to finish. Can't imagine what it was like for people a few blocks back from me. It's probably impossible, but if they offered assigned seating then people could spend those two hours visiting the sandboxes or doing codelabs or actually eating breakfast in a relaxed, casual fashion instead of being amazed and confused by the length of the line and stressing about the ever-approaching starting time for the keynote.
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