Ed Purcell is probably one of the least famous but amazing expositor of Physics that I have come across. His book on electricity and magnetism (part of Berkeley Physics Course) is one of the best introductions to the topic (but again not very well known)
Edit: Linking to the amazon page of the US edition, which seems to be out of print(<a href="http://www.amazon.com/Electricity-Magnetism-Berkeley-Physics-Course/dp/0070049084/ref=pd_sim_b_6" rel="nofollow">http://www.amazon.com/Electricity-Magnetism-Berkeley-Physics...</a>)
Has anyone attempted to recreate the original Fermi problem? Fermi was in a bunker during the first nuclear test, and approximated the power by measuring the displacement of paper shreds due to the shock wave.
Also this: <a href="http://research.microsoft.com/en-us/um/people/leino/puzzles.html" rel="nofollow">http://research.microsoft.com/en-us/um/people/leino/puzzles....</a><p>Does anyone know of any good books with these kinds of problems?