I imagine a lot of people have been thinking about the feasibility of cloud computing given that even the "has worked fairly well" concept of web hosting has been shaken up in recent weeks.

http://www.datacenterknowledge.com/archives/2009/07/06/the-day-after-a-brutal-week-for-uptime/

http://www.techcrunch.com/2009/06/29/yes-rackspace-is-down-and-so-are-many-of-your-favorite-sites/