1:
Drink 8+ glasses of water everyday.

2:
Change your diet. Eat lots of veggies and fruits. Really. Try fiber supplements if you want.

3:
Over the counter remedies. Clean and Clear and Neutrogena works pretty well for me.

4:
Prescription remedies. Nothing worked for me, but a lot of people I know use Retin-A. Or you could be even bolder and try Accutane.

5:
Expensive crap. Proactiv, Wexler.

6:
Asian remedies. I'm using some cream that's made of pearls (or so it says), and my skin usually doesn't break out unless I've been eating junk food for the past couple of days.