Cycle it!
It is important to cycle your creatine. Recent studies published I believe in Muscle and Fitness or Ironman, showed that people who didn't cycle their creatine had fewer gains then the people who cycled it. As you may already know, there are creatine stores in your body (Duh) creatine supplementing makes sure that they are constantly replenished during workout. Anyhow over a period this effect is lessened. The Bodies response to the supplementing is greatly reduced. In some cases creatine levels were even lower when the creatine was taken over a long period of time, they eventually return to normal levels when stopped. Your body will never completely stop producing creatine.
Also regular creatine is very unstable to water. It will disrupt ph levels in the stomach. Effervescent Creatine and I believe micronized eliminate this problem.