Fantastic cards! They're roughly system-independent, even though they were designed to work with 3rd Edition OGL. They work with 4th Edition D&D as well, though. In fact, these are easily on par with the cards made by the 4th Edition Character Builder, but more flexible, allowing for DMs and players to write in their own values. And it's free--who can complain?
[5 of 5 Stars!]