Here's how to do it like a pro: Start with a high-wattage ionic blow-dryer, like this T3 Featherweight 2 Dryer.
It will reduce frizz by compressing the cuticle, which locks out puff-inducing moisture. (It will also cut drying in time in half—nice.) Set it on medium heat, since high heat causes the cuticle to swell; if your hair is curly, use a diffuser to dry curls evenly.
Style hair with a brush made of boar and nylon bristles—boar bristles help distribute natural oils and product, sealing and smoothing the cuticle. If your hair is curly, ditch the brush and use your fingers.
And you know how humidity causes frizz? Well, drying your hair in a muggy bathroom has the same effect as standing in a rain forest. Move the dryer to your bedroom, or wait for the bathroom fog to lift. Don't shut off the dryer until hair is 100 percent dry.