what kind of bikes do you mainly have? I like Zinn's road bike books, but I don't own any MTBs. The Park is also good, but Zinn gives you great instructions. I too have a lot of bike wrenching experience, but I like a good book to learn new fine points, help deal with unusual situations, and remember what I forgot.
Specialized Sirrus, Specialized Rockhopper, Cruiser Ice Bike
Another suggestion would be the book by Mel Allwood. Mountain Bike Maintenance The Illustrated Manual. She also has one for road bikes. Looked around and this one fit my needs better than the others. Personally didn't like the Zen books.