I am guessing a few others use violinlab.com since I heard about that place from here, so I am posting the information here so you can address any security issues necessary.

Earlier today violinlab.com was hacked.  The result was a long list of usernames and clear text passwords ended up being mailed out to many users on the site, and most likely the hackers also have that information.

ViolinLab posted that credit card information was contained on another system by another company and that was not breeched.

The hackers would have had access to any other information you had in your profile, such as email address, address, phone number.

They initially shut down just the password system, but as of this point in time the full system is shut down.

If for some reason you use the same password on other sites, you should change it now.   (And probably look in to a password management system and use different passwords for other sites).

I would highly recommend changing your password as soon as the site comes back up.  I am hoping they when they bring it back up they bring it back up with all accounts locked so we have to request a password reset.