There is an interesting commentary by Caren Meyers: Morrison on United States v. Jones

Caren Myers Morrison (Georgia State University – College of Law) has posted The Drug Dealer, the Narc, and the Very Tiny Constable: Reflections on United States v. Jones (California Law Review Circuit, Forthcoming) on SSRN.  Here is the abstract: 

This past January, the Supreme Court held unanimously in United States v. Jones that the installation and use of a GPS tracker on a suspected drug dealer’s Jeep constituted a search under the Fourth Amendment. The outcome had been fairly well foreshadowed: at oral argument, the Justices had seemed perturbed by the thought that police could put trackers on cars — even the Justices’s own cars — seemingly at will, and there was a clear thread running through the questions that the practice smacked a little too much of George Orwell’s 1984.

For a less academic reaction to the Jones case see “FBI chief describes GPS problem from court ruling” by Pete Yost of The Associated Press in this report.