My short article on the signing statement--"Contextualizing the Signing Statement"--appears for a short time in a free preview offered by the publisher of Presidential Studies Quarterly.
Furthermore, if you are interested in the signing statement, MSNBC's Live with Dan Abrams has a segment featuring Jonathan Turley and Charlie Savage, who Abrams says "has done more than anyone else to lift the veil of secrecy" on this practice. It will give me a heart attack one day.