Check out the interesting exchange between Seth Tillman & Brian Kalt on Northwestern's Colloquy. Here are the links:
Seth Barrett Tillman, Senate Termination of Presidential Recess Appointments, 2007 Nw. U. L. Rev. Colloquy 2, online at http://ssrn.com/abstract=956164 or http://northwestern-colloquy.typepad.com/main/2007/01/senate_terminat.html
Brian C. Kalt, Response, Keeping Recess Appointments in Their Place, 2007 Nw. U. L. Rev. Colloquy 3, online at http://ssrn.com/abstract=959051 or http://northwestern-colloquy.typepad.com/main/2007/01/keeping_recess_.html.
Seth Barrett Tillman, Terminating Presidential Recess Appointments: A Reply to Professor Brian C. Kalt, 2007 Nw. U. L. Rev. Colloquy 4, online at http://ssrn.com/abstract=962100 or http://northwestern-colloquy.typepad.com/main/2007/02/terminating_pre.html