Here's some sites to help generate test data.
Joe Strazzere has a blog post with strings used to check field lengths: http://www.sqablogs.com/jstrazzere/538/Some+Strings+for+Pasting.html
James Bach wrote a Perl script to generate self describing data strings: http://www.satisfice.com/blog/archives/22
Graham King has a script to generate fake credit card numbers in Java and Python. Includes credit card types: Mastercard, VISA 13 digit, VISA 16 digit, AMEX, Discover, Diners Club / Carte Blanche, enRoute, JCB 15 digit, JCB 16 digit, and Voyager. Credit Card Number Generator: http://www.darkcoding.net/index.php/projects/credit-card-generator/
Benjamin Keen's site allows you to select the fields used in the data file: http://www.generatedata.com/#generator
This site will send you a list of fake names, but you have to e-mail a request. They sent me csv file containing 3000 people. Fake Name Generator: http://www.fakenamegenerator.com/