Enough poorly thought out and/or underfunded online services are dying that someone has started a death watch blog. This is a market where too many startups thought they were going to capture 10% of the market and make gazillions with their wizzy Web 2.0 service (file storage, online collaboration, etc.).
Many of these services are just quietly turning off the servers with little or no notification of their customers. So buyer beware if you are storing all your company documents or family baby pictures on one of these sites--your backups may just disappear one day.