The answer is.... (Score 1)

its logic guys, quit trying to re-invent the wheel.

turn on switches one and two, and wait about a minute.

then, turn off switch two and immediately go into the room.

if the bulb is on, its switch one. if the bulb is off, but still warm, it was switch two. if the bulb is off and cold, then it was switch three.

man, how many /.ers just wanted a multimeter? 8^)