The best oil control i've found is Philosophy "Clear Powder".
The consistency is perfect, thin but not too watery.
I dot it on to a make-up sponge and lightly dab over my foundation on the areas that tend to get oily. It doesnt take any of your make-up off and leaves you with smooth shiny skin that doesn't feel tight or dry.
I recently changed to Clinique's new Pore Minimiser "T-zone Shine Control" but it just doesn't come close, I didn't like the powdery residue it left on my face and thought it dulled my make-up slightly, too powdery and un-natural looking.
I'l definatley be changing back to philosophy!