A few years ago, I started with creatine because I was doing bodybuilding-type exercises in the gym (my goal was to increase strength and muscle mass), using weights that I could eke out 8-12 reps per set with. At the time, I did quite a bit of reading online about creatine, and from what I understood (and I haven't done any recent research on it, so I don't know what, if anything, has changed with this supplement), creatine does help with short-term, explosive movements like strength training and bodybuilding. The most common form of creatine is creatine monohydrate, which, unfortunately, is poorly absorbed, and can cause bloating. And you need quite a large dosage to get any into your muscle tissues.
Then I learned that, supposedly, a better form of creatine is creatine ethyl ester hcl (CEE). Better absorbtion by the muscles, without the bloating effects of regular creatine. And less is needed to get the same strength-enhancing effects. I took CEE for a while, and it did seem to help me power out a rep or two more per set, than I could previously. How much of that was psychological and how much was real strength enhancement, I'm not sure.
Take a look at this page about CEE on bodybuilding.com - it gives you the basics:
http://www.bodybuilding.com/store/cee.htmlGood online store, btw. I've had mostly good service from them.
Doug