Thanks everyone for your ideas. I'm going to wait until it happens aganin and start by checking the panel box (on the inside of the house) and the main breaker (on the outside of the house). Seems to me if I have a drop in voltage on one of the legs coming in to the main from the power company then it's the power companies problem. If I have a drop in voltage somehwere else in the main or the panel well then I can work backwords to find the problem.

Niko...yes I'm absolutely positive it's more than 1 circuit. The electric stove goes out, the washer but not the dryer, the furnace goes out, part of 1 bathroom, and one of the upstairs bedrooms. IT SEEMS LIKE IT IS ROUGHLY HALF THE HOUSE! The other half is fine.

What I don't understand, and maybe you guys can help me with this. I don't understand how this is possible? Can anyone explain how this could be?