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The American Institute of Certified Public Accountants (AICPA) website contains numerous links to Sarbanes-Oxley related information.
http://www.aicpa.org/_catalogs/masterpage/Search.aspx?S=sarbane+oxley
The COSO internal control framework is the foundation of all Sarbanes-Oxley 404 engagements. Visit the COSO site for more information.
CFO.com is a good resources for Sarbanes-Oxley related information and resources.
Compliance Week provides white paper and articles about Sarbanes-Oxley. Visit the site for more information.
http://www.complianceweek.com/
Sarbanes-Oxley compiles the latest information from around the internet in a useful portal.