After listening to continuous gripes about Thomas, the Library of Congress' free legislative database, the library is heeding demands for expanded features. Thomas users will be able to easily search records from previous congressional sessions and browse legislation by sponsor, officials said.

Visitors will also quickly find information such as the status of bills, their cost estimates and updates from Senate hearings.

Officials said some cosmetic changes will appear in early September, including a redesign that mirrors the library's new Web site and tools to simplify navigation.

"We hope, by year's end, to deliver several enhancements to the current features to provide for quicker searches with more relevant results," said Kevin Novak, director of education outreach and Web services at the library's Office of Strategic Initiatives. "The release of Thomas set for early September is a refreshment of the site with a new, more pleasing look and feel."

Since Thomas debuted in January 1995 as a congressional initiative, lawmakers have called for the library to let users search information from previous congressional sessions and bill amendments. Although library officials are finally listening 10 years later, the extent of the renovation is uncertain. They have not finalized new features and search capabilities, officials say.

Last winter, Sen. John Cornyn (R-Texas), a proponent of open government, said he wanted Thomas to offer online access to more legislative documents, such as voting records, Congressional Research Service publications, Senate gift reports and committee documents.

In the library's fiscal 2005 budget, Congress called for Thomas to become more comprehensive and accessible. Two weeks ago, Sen. Patrick Leahy (D-Vt.) wrote in an e-mail message that a significant upgrade would allow all users to find a wider range of information is overdue.

He wrote that he and a small bipartisan group of senators spent much time last year talking with information technology specialists at the library. The lawmakers requested the capability to search information from previous congressional sessions, not just the current one, and access information about individual bills, such as summaries, texts, status information, cosponsors, reports and cost of programs.