The day is here, boys and girls – I/O 2013 registration is open! Even at $900 a ticket ($300 for academic attendees), they sold out in 25 minutes last year. We expect the same thing to happen this year, so if you want to go, hopefully you waited until after you picked your ticket up to read this post.
If not, though, a couple of things to keep in mind: you'll need a Google+ account, as well as a Wallet account, to register.
What are you waiting for? Go!
Update: For those who aren't going, this is the sight that many, many people are seeing right now:
Update #2: ...And the follow up to said screen:
Ouch. This isn't looking good. We're already 15 minutes in, tickets will be gone soon enough (if they're not already).
Update #3: Unless, of course, it actually finds a ticket...