It sure beats getting a call from a robot
If you're using a service that allows 2-step authentication - GMail and Dropbox are a couple of high-profile names - you really ought to be using Authomator. The main screen of the app lists all your accounts and the currently active codes for each one. Each account allows you to add a custom title for it too over and above just the registered email address.
Adding accounts can be done manually by adding the necessary keys, or if your service provider allows the use of a QR code, Authomator will scan that instead. Upgrading from the free to premium version will allow users to add certain accounts as favorites and get rid of those pesky ads. Security-conscious BlackBerry 10 users will probably want to pick up Authomator.