I currently read FItness RX, Oxygen, Shape and Muscle and Fitness Hers. But I prefer books for info, because they are more in-depth and not so repetitive. I also like books by people who have an actual degree in sciences or kinesiology or some other related field (preferably a master's or PhD). I also look for information that combines safety and effectiveness.
Human Kinetics is a publisher that has many excellent books (with the exception of "Sculpting her body perfect"...blech!)
I have about 4 dozen books in my "fitness" collection (doesn't include my nutrition books). I grabbed some of my favorites off the shelf and, in no particular order, here they are (starred items * are "Must haves" IMO):
*"Effective Strength Training" by Douglas Brooks. Brooks writes some excellent books, and is very much into safety and effectiveness. I'd love to have him as my personal trainer. (Interestingly enough, there is a DVD out with a workout of his on ==from the 80s or whenever mullets were "in"!--and he uses some form in the DVD that he advises against using in the book. I follow the book.)
"The Body Sculptig Bible for Women" James Villepigue and Hugo Rivera.
*"Optimal Muslce Training" Ken Kinakin. Comes with a DVD with forms on for self-testing and for having a health professional test you for muscle function and imbalances. The DVD also shows the form of about 100 moves. The book focuses on how to avoid imbalances, how to choose exercises that have a high degree of effectiveness and a low risk of injury---and rates several variations of common moves.
*"Men's Health Home Workout Bible" by Lou Schuler. Over 400 exercises for at-home, using dumbbells, barbells, no equipment, etc.
"Designing Resistance Training Programs" Steven J. Fleck and William Kraemer. Gives lots of info on types of strength training programs and how to set up an individual one for you.
"Functional Fitness" by RoseMarie Gionta ALfieri. Talks about the benefits of functional training and shows moves using balance devices, stability balls, and balance challenges (like standing on one foot to do bicep curls).
"Serious Strength Training" by Tudor Bompa, Ph.D. Explains periodization and how to design a strength trainig program for maximum gains. SHows how training differs for maximum strength, maximum size, etc.
"Powersculpt" Paul Frediani. (Now out as "Powersculpt for Women" with a workout DVd iincluded). Stabilty ball exercises, starting wiht a stability test, and showing some very advanced moves (kneeling on the ball anyone?)
"Weights on the Ball Workbook" Steven Stiefel. Lots of exercises for the stability ball, with several variations of each exercise.
"ACE Personal Trainer Manual." Textbook for those who want to take the ACE exam to be a personal trainer. The scientific stuff is rather heady (sliding filament theory, muscle typi8es, etc.), but it's a nice book to have around.
"A Woman's Book of Strength" by Karen Andes. An interesting presentation of weight training, showing you how moves can be an injury risk because of the angle at which pressure is applied to the joint. Offers some safer variations of some moves. Delves into "inner strength" as well.
*"The Insider's Tell-All Book on Weight Trainig Technique" by Stuart McRobert. FOcuses on correct form for exercises for avoiding injury and making maximum gains. McRobert edits a magazine called "HardGainer" that is geared towards bodybuilders who have a hard time putting on muscle. He also emphasizes safe moves and shows how some often-used exercises (ike upright rows) are dangerous and should not be used by most people.
;-) 
