I just got up (it's morning in Israel), and a client of mine in the US with a major, mission-critical application was screaming (rightly so) that things are down.

We're already looking into alternatives -- perhaps not leaving Heroku altogether, but certainly not depending on them 100 percent. There's no way that we can entrust the business to something that can just catastrophically fail at any moment. I've been running my own servers for years, and they've never had such unpredictable issues.

I increasingly have to think that a few servers, on different providers, with the application deployed via Capistrano, will be more fault-tolerant than Heroku. At least, it seems that way right now.