Scott kelbys 4 book series (the title flees my mind right now) is great for some all around great info and practical application tips.
I've read 2 or 3 of Kelby's photograpy books (I think they are simply called The Digital Photography Books). I found them hard to read because his really bad sense of humor distracts you from the good photography stuff. IMHO, he could have condensed all 4 of his books into one volume of about 150 pages if he just cut out the lame humor.

