I have no idea why these have to be on 28 separate pages. They look nice, but I gave up looking after page 3, so who really knows.
I noticed this too. The noun project (http://thenounproject.com/) has a better interface where, when you reach the bottom, the next batch auto-loads into view.
The icons so look decent here though.
A creative commons license might be better. As is, I have no idea if I can modify these or not.