What about little RC cars? Or little mini-helicoptors you can buy from Brookstone (hear them here) Small drills? Get into a dentist office and record all of his cool drills and such (bring your mic next time you visit). Any digital printing facility. What about electric toothbrushes? Some chiropractor's equipment has a great motor sound to it (his table you lay on goes up and down). X-ray machines sometimes have great motor sounds.
I recently recorded an inflatable camping mattress's motor it uses to blow it up.
I also recorded my plate reverb's mechanism is uses to lengthen the decay time - makes a cool motor noise.
I also had a hard drive die on me and it made some great sounds.
Sun roof motors.
I recorded a building's wheelchair lift and it sounded awesome.
Don't forget you can record bigger motors and pitch them up real high and they sound like tiny small mechanisms and vice versca...
Colin Hart released a power tools library recently...
Lots of good servo stuff on a modern ship.
Garage door openers..
Older tape recorders, old film playback equipment, line conditioner equipment, air compressor motors, small vacuum cleaners, older computers...
I remember as a kid, after I broke my arm the doctor took the cast off with some piece of equipment - sounded interesting.