Best Facial Sunscreens for Oily Skin (by Request)

In response to the Anonymous reader who wanted a facial susncreen that she could use under her makeup, that wouldn't clog pores or make her skin greasy. My favorites are Neutrogena Ultra Sheer Dry Touch Sunscreen and June Jacobs Oil Free Sunscreen Mist. The Neutrogena is quite light and leaves a nice matte finish on the skin, but I think the absolute best sunscreen for oily skin is June Jacobs Oil Free Sunscreen Mist SPF15. It's weightless and virtually imperceptible on the skin - almost like water. It's amazing, and not at all greasy.
The other alternative is to use a foundation with sunscreen in it, like one of the mineral powder foundations, for example, and then just apply sunscreen on your neck, hands, chest, etc.
Sunscreen is SOOOO important, no matter what your skin type, but you might have to experiment with a few to find one that works for you. Let me know how you do!
As for primers, I don't recommend them for someone with oily skin. Primers generally fall into two categories: those that are mostly silicone based, like Smashbox Photo Finish, and those that are essentially highlighting creams. The silicone based primers feel really nice going on, and fill in all the little grooves in your skin, creating a smooth surface for foundation, but they are quite moisturizing and not suitable for oily skin. Highlighting creams are also moisturizing, and add unnecessary cheen to oily skin. If you want the effect of a primer without the slickness, try using a highlighting powder over your mineral powder foundation, or over your conventional foundation and powder combo.