How to Become a Good Theoretical Physicist: Gereard 't Hooft.

A sobering experience for anyone thinking they've solved all the problems in modern physics. It contains links to many physics resources including lecture notes and online books.

How to Become a Bad Theoretical Physicist: Gereard 't Hooft.

If becoming a good theorist is too hard.

Incomplete solutions to Jackson's Electromagnetism, 3rd Ed. at Rutgers.

This document is over 113 pages long, but covers quite a number of problems.

More solutions to Jackson by Barbara Mattson

Just what the links says. The problems are in individual ps and pdf files making downloading easier.