The Subcommittee on Oversight and Investigations of the House Armed Services Committee issued a report on Presidential signing statements: Findings of the Subcommittee on Oversight and Investigations in Support of the Full Committee re: Presidential Signing Statements (PDF, 4 pages). It is also available here from the Federation of American Scientists Project on Government Secrecy, which describes the report here: White House Signing Statements “Unsubstantiated,” Report Says, by Steven Aftergood, Secrecy News, August 20, 2008.
The Subcommittee held hearings on signing statements (“Testimony on the impact of the Presidential signing statement on the Department of Defense’s implementation of the Fiscal Year 2008 National Defense Authorization Act) on March 11, 2008. Prepared statements and audio transcripts are available on the Committee’s hearing information page. (Nothing is available from GPO Access yet, apparently.)
Also see: Essential Reading About Signing Statements (which includes links to audio files of the hearings from hascaudio.house.gov, but which I had no success in loading) and News About Signing Statements maintained by Joyce A. Green.
Just browsing around this important topic and trying to find a single, reliable link to all the information from the government is a good demonstration how far we have to go to get good access to government information.
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