When Your Hosted Service Goes Down

Google’s Grand Central virtual telephone service was down in in middle of February. Hosted application provider Long Jump was down for about 2 hours some time recently as well.
These are just two in a string of many examples of hosted application providers big (like Salesforce.com) and small being down, and it is to be expected. Just like your server goes down.
However, you have to be prepared for this. This preparation includes preparing your employees, your partners and your customers for what happens if you are unable to conduct business as usual for a few hours?
Two solutions come to mind: Have a backup Internet Service Provider and have a backup service provider for critical applications who might be able to perform some functions until your main service provider gets working again.
Hosted applications rarely go down, but when they do you need to be prepared.