CRJ,
I have the Ace The Technical Interview book and find it 'so so' as far as explanations go. Theres some obvious mistakes, as well some of the answers which arent particularly well worded. There are some good questions in it however and worth a read if your struggling to find something else.
To be honest though, every interview is different...some are full of tech stuff, some love the HR questions, some just have a chat with you over a beer at the bar! I had 2 interviews recently and to be honest, I wasnt asked anything that even remotely resembled any of the questions from the Ace book. In one interview I was hit with loads of rule of thumb IFR calculations and asked to work them out ie. Top of descent point, rate of climb, rate of climb/decent, height on glideslope given a dme readout, distance/speed/time etc. Theres none of that stuff in the book so I could arguably say the Ace Book was a waste of time for me.