like abear says, creatine is about energy transport in the muscle cells, and making sure you have enough for effective/efficient energy production during a workout.
so, indirectly, creatine supplementation can help you hit your peak NATURAL energy levels during a workout. If the workout routine is good, and diet is good, then this supplementation COULD translate into better gains.
that's the 'nutshell' answer. I'd still suggest you read the FAQ, if anything to avoid buying any useless supps.