The Library of Congress's web page allows the researcher to search for statute by title, popular name, bill number, and author. It also provides some legislative history materials and updating tools (see Keeping Current).
Govinfo allows a variety of search options for Congressional bills, documents, hearings, reports, and the U.S. Code.
Cornell's web page provides several tools to aid researchers, including searching, table of contents, popular name table, and RSS feeds by title to keep current.
United States Code is the official version of the federal statutes. It is organized topically and provides the text of the statute as well as a legislative history note. There are 51 titles in the United States Code.
You can search the U.S. Code by using the Index, Table of Contents, or the Popular Name Table.
The United States Code is updated with an annual supplement.
Statutes at Large is an official publication organized chronologically (as opposed to topically). Each set includes the text of the acts, a subject table, and popular name table.
Many acts are given titles such as the Affordable Health Care Act or the Patriot Act. Sometimes acts are named after the legislators who authored the bill or in honor of someone such as the Dodd-Frank Act or the Lilly Ledbetter Fair Pay Act. These titles are the popular names of the act. The Popular Name Table provides a list of all named acts and points you directly to their location in the United States Code.
Bluebook example: 26 U.S.C. § 2102 (2006 Supp. 2011).
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After many years of only 50 titles, there are now 51 titles in the U.S. Code. The fifty-first title is, "National and Commercial Space Programs." Remember to check the coverage of the resource you are using, whether print or electronic. Finally, remember to always update/KeyCite/Shepardize your research.
The text of the U.S. Code is also located on the Office of the Law Revision Counsel webpage. The page includes a variety of helpful resources.