While working on some application security requirements for a client, I came across this little nugget about cracking pgp passwords using a cloud.
Cracking Passwords in the Cloud
It's interesting to see how easy it has becomes to brute force passwords using distributed computing. While brute force attacking passwords for the average person is still time-prohibitive, even with a cloud, the ability to reduce password cracking times from years to weeks is impressive. Cracking performance will continue to increase as distributed computing becomes cheaper, faster and more widely adopted.
Take a look at the article and think of how this could affect your data: Cracking Passwords in the Cloud
If you haven't started to really focus on application data security, perhaps you should...