An important book that appeared in 2006 is Joëlle Delattre (ed.), Sur le Contre les professeurs de Sextus Empiricus (Lille: Presses de l’Université de Charles-de-Gaulle–Lille 3). This collective volume is devoted to Sextus Empiricus' least-known work, namely, his Adversus Mathematicos.
In my view, Richard Bett's "La double ‘schizophrénie’ de M. I–VI et ses origines historiques" is by far the best essay in this volume. He maintains that the tensions detectable in Adversus Mathematicos are to be explained by Sextus’ drawing on different Pyrrhonian sources and by his failure to adapt fully earlier skeptical arguments to his later version of Pyrrhonism. These arguments would have the same origin as the negative arguments found in the fifth book of Sextus' Adversus Dogmaticos.
More information about the book can be found here.