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Yeah I've been reading that it all depends on the type of FET you use with the heat/burn problem. That's just a matter of finding the perfect component I believe.  The delay was the real issue I was concerned with, but like NooM stated I might have something wrong on my breadboard. I got the (Switch On)->(Light On) so figured it was correct but that was probably a false assumption. Will be reworking it with the driver circuit NooM posted to see if there are better results.  Thanks for the advice.

Yeah I figured I'd have to cool the mosfet at some point, that's not too big of a problem. I can drive the motor with as little as 12v but obviously it will stall quite easily lol.

Have you experienced the delayed switch-off that I"m talking about with mosfet? It's might have been my particular circuit, I'm not too positive. I've seen a couple different solutions, but I figured I could push the button on the netduino -> activate Opto -> trigger mosfet -> turn on light.. it had to have been ok circuit-wise.

Thanks for the speedy reply, and the references. I'll be looking through everything tonight a little more. The MC-60 (motor controller) was to drive a 90v DC motor, so the voltages for most examples aren't what I need but the theory is still the same.  I have successfully isolated the netduino with optocoupler, and have this signaling the transistor, which is supplying the PWM to a test-lamp. Everything works except I salvaged a MOSFET from an old board, and the switch-off time lingers. In other words I don't think that'll do for the switch-speed required for PWM. I tested this by just using the button function on the netduino to turn the test-lamp on/off. Comes on real fast, but takes a second to drop completely off once released. After reading a bit I found that most MOSFET need a driver to solve this problem. Going to try the NPN before I go down that road. If that lingers I'll look into the Opto for the delay.