GPO has a new version of its Comparison of Legislative Resources on GPO Access and Selected Government and Non-Government Web Sites (October 2008). It has separate files with tables showing the 34 GPO Access legislative
resources studied and the scope of each of eight Web sites examined. (Scope of GPO Access and Government Web Sites and Scope of GPO Access and Non-Government Web Sites.

The study compares legislative information available on GPO Access to House.gov, Senate.gov, THOMAS, Lexis-Nexis Congressional, Westlaw, CQ.com, and HeinOnline.

The study finds that GPO Access contains a unique mix of online legislative resources not duplicated in total at other sites. ("No Government or Non- Government Web site, other than GPO Access, contains Economic Indicators, Independent Counsel Investigations, State of the Union, United States Government Policy and Supporting Positions (Plum Book), and the United States Government Printing Office Style Manual.")

But, "In terms of scope of the legislative resources it provides, GPO Access is behind the other Web sites evaluated. Many of the other sites either contain historical content on their service or link to external sites with historical information, whereas GPO Access possesses current information that generally begins in the mid-1990s."

The last study (2003) and previous studies are still available at http://fedbbs.access.gpo.gov/library/compare/.