This is an outstanding overview of Garage Games' Torque Game Engine. Any aspiring game maker needs to have a copy of this book for reference. Torque allows rapid proto-typing of game ideas, supplying all the foundation for rendering, animation, sound, networking, scripting, all for both the PC and Macintosh. My own teenagers (pictured on the cover, CD, and page 31 :-) use a $25 copy of Milkshape 3D, and put their own models, sometimes with their own rigged, animated skeletons, right into a $100 copy of Torque, and play their own games.
After you've hooked your wannabe game makers with Torque for Teens, send them over to the perfect followup book:
3D Game Programming All in One, Second Edition
Torque has quickly become the number one game development and design harness for nearly all high school and college level game theory, development, application, and graphic design classes.