A couple of other books to look into are:
Essentials of Otolaryngology by Frank Lucente. ISBN: 0-7817-1463-X
and
Essential Otolaryngology by KJ Lee. ISBN: 0-07-137322-5
Lucente's is a small book that easily fits into a white coat or into your bag, and has a small chapter on most common things that you'll encounter in clinic.
KJ Lee is a thick 1000+ page textbook that may be useful to leave where-ever you're staying so you can look stuff up at night that you encountered that day, or might see the next day. It's not a particularly friendly textbook to read, but it was pretty popular among a lot of ENT residents I worked with. It isn't as huge as the multi-volume texts like Cummings or Bailey, but it's got enough detail to really get into most topics within ENT.
I agree with the others though. If you are only going to buy one text, make it ENT Secrets, and know the thing as inside-out as you can.
As for away rotations, the same things as with home rotations. Work hard, be keen, write notes and orders, study the relevant anatomy the night before the OR... Enthusiasm goes a very long way, often a lot farther than just pure knowledge.
