Bookmark this great new site for coupon code searches: RetailMeNot.com.

It's made by the same people who brought us BugMeNot.com, and works in much the same way.

Enter a website, and it displays coupon codes from its database. Each code has an option to vote whether it worked for you or not, and displays the success percentage rate. This helps to weed out bad or dead codes.

The database is filled by user submissions, which can lead to codes like this:

Code: 12345
Description: Password to Earths air supply

However, within 8 hours of a Digg user pointing out the bogus submission, it was removed. It's easy for good codes to get in, and easy to police bad or useless codes, in real time.

The site just launched, so give it some time to popularize and it should end up being pretty darn useful.

RetailMeNot.com. (Thanks to Paul!)