-Avoid stress as much as you can
-Don't binge drink
-Be careful with what creams/lotions and makeup you use
-Oil blotting papers, I like shiseido oil blotting papers
-Clarins have a good mattifying moisturiser for oily skin, and good alcohol-free toners. I prefer the green one w/iris but they also have a different one with powders which is good for very oily skin
-Use pure aloe vera gel as a night treatment, you can get it at health food stores, etc.
-Avoid cosmetics with ingredients such as isopropyl myristate and paraffin/paraffinum/mineral oil (same thing, different terms)
-Try not to use a lot of hairproducts, esp. pomade and such. When you sweat, or go to sleep with that stuff in your hair, it gets in your face and clogs your pores

-Shower in lukewarm or even cold water, avoid very hot showers and baths