The Kickstarter website offers an "Important Kickstarter Security Notice" announcing that the crowdfunding service suffered a data breach last week (thanks The Verge). While no credit card information was compromised, details including usernames and encrypted passwords were accessed, so they apologetically warn users to change these passwords wherever they were in use:

No credit card data of any kind was accessed by hackers. There is no evidence of unauthorized activity of any kind on all but two Kickstarter user accounts.

While no credit card data was accessed, some information about our customers was. Accessed information included usernames, email addresses, mailing addresses, phone numbers, and encrypted passwords. Actual passwords were not revealed, however it is possible for a malicious person with enough computing power to guess and crack an encrypted password, particularly a weak or obvious one.

As a precaution, we strongly recommend that you create a new password for your Kickstarter account, and other accounts where you use this password.

To change your password, log in to your Kickstarter account and look for the banner at the top of the page to create a new, secure password. We recommend you do the same on other sites where you use this password. For additional help with password security, we recommend tools like 1Password and LastPass.