There is so much remember nowadays regarding passwords, credit card numbers and phone numbers that it's no wonder we get confused and disorganised.
Sometimes it's wise to let a piece of software do the hard work of remembering for us which is what QWallet attempts to do. It stores an array of information from credit card info to phone numbers in an easy to use application which sits in your system tray. When you need to use a credit card, just click on the QWallet icon in the system tray, and drag and drop your credit card number and expiration date directly onto the web page. Now, this might seem all a little insecure and I have to admit, I'd be wary of using it but the developers assure that it's highly encrypted and just about bulletproof to all but the most determined hackers. Note that the program never sends your information over the internet - it simply provides a relatively quick and easy way to look up and use those items you need. The information stored in QWallet can be password protected and encrypted at any time you want.
A much quicker and easier solution that trying to reach for your credit card everytime you need it although if you're not willing to take chances with security, stay clear.