TeuxDeux is a simple, designy, free, browser-based to-do application. The idea was to build a bare-bones, but visually compelling and highly usable to-do app: Use the free browser-based TeuxDeux at work/home and then take your to-dos on the road with the iPhone app.
You can also print a beautiful copy of your TeuxDeux list. They added a lovely print.css that makes it easy. Just print and they take care of the styles.
License: License Free