They even copied the pricing page verbatim, I have personally incorporated some 37signals design elements in my own websites but nothing to this extent. 37signals is a bit hypocritical in my opinion because they brag about their design practices and then whine when someone copies it, either you're an open company sharing your inner-workings with the world or you're not, they can't have it both ways.
Wow, they even copied a lot of the CSS ids/class names.
> 37signals is a bit hypocritical
There's a difference between leveraging the lessons learned/data gathered from a particular design and copying the design itself nearly verbatim. A big one.
http://www.curebit.com/pricing