If I knew it was going the way of the dinosaurs in an hour, well, there's not much I'd really do. Nothing on the internet that's really high on my to do list. It's mainly a convenient shopping and news tool for me. Zero Punctuation is really my only internet dependent source of entertainment. I'm actively online maybe 2 hours a day.
My mom on the other hand would flip. She's much more of a techie\internet socialite than I am. She was walking around like a manic zombie the day twitter went down. I don't even have a twitter, myspace, or facebook account. I also use a small, localized bank, so a catastrophic internet failure wouldn't even affect my money. She always jokes that she gave birth to a senior citizen instead of a kid.
I suppose I might have to actually start going back to blockbuster though. Can't see netflix really working without, you know, the internet. No internet would also render my Kindle rather useless. Other than those two things, I'd be fine.