Another key book published in 2003 is Richard Popkin's The History of Scepticism from Savonarola to Bayle (New York: Oxford University Press), in which he defended the thesis according to which the rediscovery of ancient skepticism played a crucial role in the formation of early modern philosophy.
As I noted in a previous post, this edition of The History of Scepticism was fully revised and considerably expanded. Popkin, who died in 2005, could include in this last edition of his pioneering book discussions of quite a few modern figures whose positions were not examined in the previous editions. He also took into account the specialist literature published since the 1979 edition. You'll find more information about the book here.