The Parallax BASIC Stamp Activity kit features the very popular BS2 microcontroller, and features a component kit and 350 page manual with 40 projects!
The Applied Sensors Kit teaches you about interfacing the world to microcontrollers.
The BASIC Stamp Discovery Kit (USB) is a great way to learn the Basic Stamp.
123 Robotics Experiments for the Evil Genius by Myke Predko is a great starting point for anyone who is just interested in either electronics or robotics.
The What's a Microcontroller? Kit is complete beginners curriculum to microcontrollers and the BASIC Stamp.