The best explanation of entropy and thermodynamics I've ever seen:
The math is mostly simple, integrals are required only once that I noticed. If you've always wanted to understand thermodynamics, now's your chance.
This post is such a wonderful reference that we need a permanent link to it somewhere. The reference library would be a good place, but changes to it are difficult to accomodate with the current software, so hopefully we'll remember this post when it becomes easier to maintain pages of reference links.
Parenthetically to Rrhain: Sears/Zemansky? Didn't the ancient Romans use that text book?
--Percy