One of my long-time favorite websites, delicious.com has been off the air for five days now. I don't care how great your website is, if it's down, nobody can use it. I was talking with a prospective client yesterday and she asked about uptime. So I logged into the monitoring service we use and pulled the actual statistics for one of our long-time clients. Over the last week we're at 100%, last 30 days 99.99% and the lifetime of when we've hosted them is 99.94% So I think we (and Amazon Web Services who runs our servers) is doing pretty well.