Do you use multi-threading in your games?
I've never used multi-threading in any game for anything other than playing music. I don't know of any game with heavy calculations being done in multiple threads.
But today's (and tomorrow's) processors are optimized for multiple threads. Intel has HyperThreading and AMD's new processor will have double cores. I belive Intel's upcoming processor will have four cores for execution.
It seems that dividing the game calculations into multiple threads would have advantages.