I can recommend a cheap, concise and GOOD book. "National Geographic Photographer's Field Guide". ($4.95, at least used to be). with pictures, examples etc. It is 120 pages, 4' X 8" fits into any coat pocket.However, there's one drawback: he's a Nikon shooter! That's blasephemy!
I agree, that was the biggest letdown.. But, seriously... Good books, easily accessible. Just the other night I needed to quickly refresh what settings I needed to use when taking a shot of the moon and it took me less than a minute and I was ready. I did a comparison to one of the 500 page-monster books I have, took me about 10 minutes to find the location and the it rambled on about a bunch of technicalities, all I wanted was a suggested shutter and aperture.
The monster-book is great in explaining the actual workings of stuff, but for quickly finding suggested settings it is not the right place.
There's usually some interesting things to be found poking around here as well: http://ngm.nationalgeographic.com/photography