OK, I gotta say: How many people have a little digital scope laying around in their junk box?!? 
Nice project!
Some suggestions for add-ons:
Function generator
Audio amp w/ little speaker
Arrays of LEDs and LED displays
Various sensors
OK, I gotta say: How many people have a little digital scope laying around in their junk box?!?
Nice project!
Some suggestions for add-ons:
Function generator
Audio amp w/ little speaker
Arrays of LEDs and LED displays
Various sensors