Nice move by salesforce.com to show key up-time and other performance metrics for all to see. If you click on the red button for service disruption on February 8, you can see details of what happened.
As I predicted this is the year "SaaS models will come under increased scrutiny from buyers about stringent SLAs and business continuity plans.". I still expect larger customers will want to perform more detailed due diligence, but it is a gutsy move by salesforce.com to building confidence in SaaS.