I have little to add. We should find out why the bridge collapsed and take steps to prevent such tragedies from happening again.
Update by Jambo
There's not that much we amateurs can say about events like this but I think the role of the internet in the aftermath of these things is interesting. I saw a news crawl on one of the local stations last night that said USInternet was making its wifi system in the area (a city wide service that won't be fully on line until this fall) available for communication since cell phone circuits in the area were jammed. A story in the Strib this morning recounts how Wikipedia has been updating it's entry on the subject since less than half an hour after the collapse. And of course there is the email. As someone who used to take that bridge to work (I've driven over it probably 1500 times) I've received tons of email from friends making sure I was OK, including one of my friends in Argentina who saw the news on TV last night.