Check out the Fortune 500 business blogging wiki for a listing of Fortune 500 *public* blogs. It may or may not be entirely complete but it's a good place to start.
Examples of Fortune 500 blogs
Amazon.com Inc.: Amazon Web Services Blog
Boeing: Randy's Journal
Cisco Systems, Inc.: Cisco High Tech Policy Blog
Cox Communications: Digital Straight Talk
Dell: Direct2Dell
Electronic Data Systems: EDS' Next Big Thing Blog
General Electric Company: GE Global Research blog
General Motors Corporation: FastLane
Google: Google's corporate blog
Hewlett-Packard Company: HP blogs
Honeywell: Honeywell Career blogs
IBM: Guide to IBM Blogs
Intel: I@Intel
McDonald's Corporation: Open For Discussion
Microsoft: MSDN's Microsoft Blogs
Sprint: The Communications Insider (podcast)
Starwood Hotels & Resorts: The Lobby
Sun Microsystems Inc: CEO Jonathan Schwartz and General Counsel Mike Dillon and more Sun executive blogs
Texas Instruments: Video 360
Verizon: Verizon PolicyBlog
Wells Fargo: Wells Fargo blogs
Xerox Corporation: Palo Alto Research Center
Yahoo!: Yodel Anecdotal
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