I own the book, and its largely geared toward the new jumper. The rest of the information in there can be found in the SIM. Unfortunately the only other skydiving books I've read are either the Parachute and It's Pilot or non-technical (Above All Else, No ETA etc) so I won't be able to suggest any alternatives.
That book is awesome. You can hear Dan's voice when reading the words
True story: November-ish last year (late Fall, at any rate) Dan is signing books at ZHills. I'm probably 3, 4 jumps into AFF. Still nervous, had massive door fear etc. Dan asks me if I want to get a book and he'll sign it (I had no idea who we was) and my response was: nah, I'm still not sure this skydiving thing is for me. Thanks, though... or something along those lines.