Yoshihito recently published a set of three new LEGO books that I will be using in my classroom this year. They are the Red Book, the Blue Book , and the Green Book that show how to build machines with LEGO bricks.
The books show this with all LEGO parts (system and TECHNIC), and with all types of LEGO motors (RCX, NXT, power function motors). The books are full of detailed photographs of gear trains, mini cars, walkers, and motorized contraptions. I already have a few pages flagged to show to my team for ideas for grabber arms, lifters, and pushing mechanisms for their FLL robot.
The Red Book's focus is on geared mechanisms (without motors)
The Blue Book's focus in on motorized mechanisms
The Green Book's focus is on walking mechanisms
You can purchase these books at yesasia.com