The Parallax BASIC Stamp Activity kit features the very popular BS2 microcontroller, and features a component kit and 350 page manual with 40 projects!
This board is a great starting platform for learning how to take advantage of the Propeller.
The PropSTICK is USB device which lets you access all the Propeller's pins on a 0.1" format.
The Board of Education Full Kit (USB) has everything you need to learn about BASIC Stamp programming.
The BASIC Stamp Discovery Kit (USB) is a great way to learn the Basic Stamp.
If you aren't familiar with the Electric Imp, it essentially provides an easy, integrated way to connect almost any hardware device both to other WiFi enabled devices and to internet services.