I've just realized that the three books I mentioned in my previous post all have to do with Sextus. I will now refer to a book that will interest those concerned with contemporary skepticism:
Steven Luper (ed.), The Skeptics: Contemporary Essays. Aldershot: Ashgate.
I highly recommend this book. In his introduction, Luper offers a clear and useful taxonomy both of types of skepticism and of types of anti-skeptical responses. The volume includes fine essays by Gilbert Harman, Peter Klein, Ernest Sosa, Robert Fogelin, Fred Dretske, and Marie McGinn, among others. It also reprints Hilary Putnam's famous "Brains in a Vat", and David Lewis' "Elusive Knowledge". Information about the book is found here.