I recently tried a couple of products from the L'Oreal Skin Genesis line.  I was especially impressed by the pre-moisture serum.  This is saying a lot, as I have tried a lot of skin serums like those from Olay, Philosophy, Aveeno and Patricia Wexler.

I find that most serums have rely on silicone and other "-cone" products to give one's skin a smooth feeling.  They make the application of makeup nicer, but they don't do a whole lot to give lasting improvement to one's skin.  Plus they make the serum feel like its just sitting on the surface, and if its not penetrating your skin what's the point?...