Digging through my project box, I found a stash of Mabuchi FA-130's that I bough from Pololu long ago.
Mabuchi FA-130's are great little project motors. The 130 size is commonly used in toys and inexpensive electronics, and they are available in a variety of voltages and ratings. These motors are rated at 1.5v to 3v, have a free running speed of 12,300 RPM, and cost $1.99 from Pololu.
I'm going to use these motors as the basis for 10 simple creations over the next few days. Each creation will make the this simple motor do something useful.