The items generally fall into the following categories:
- Instruments (function generator, oscilloscope, etc.).
- Basic components -- like RLC, transistors, 74xx logic, basic linear ICs. Items that will be used in the 6.002x (or any other basic circuits) curriculum.
- More "interesting" components. Sensors and actuators from SparkFun. For the current purpose, I prefer sensors that have a simple analog out, than anything that requires heavy digital machinery to use. Also bringing my collection of electronic components that I've accumulated over the years...