(2) In programming, a library is a collection of precompiled routines that a program can use. The routines, sometimes called modules, are stored in object format. Libraries are particularly useful for storing frequently used routines because you do not need to explicitly link them to every program that uses them. The linker automatically looks in libraries for routines that it does not find elsewhere. In MS-Windows environments, library files have a .DLL extension.

C++ Libraries FAQ
Contains details of both free and commercial libraries, tools for C++ developers and source code.

Legislative information
"Thomas" site, hosted by the Library of Congress, and provides legislative information via the internet. There is current information on congress, bills, committee information, historical documents, and the legislative process.

Yahoo!'s online library page
Yahoo!'s directory of online libraries.