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I came across an interesting section on Forbes.com on the best of the Web with regards to B2B. While the data is a little dated (2004 - 2005ish), there is a great list of B2B companies across a wide variety of industries including:
Advertising Aerospace & Defense Automotive Business Process Outsourcing Computers Content Management Customer Relationship Management Financial Services Knowledge Services Procurement Supply Chain Management Web Services Wireless
Companies mentioned include some popular B2B brands including IBM, Oracle, Grainger, SAP, Salesforce and Net Suite. Of the many compnaies found in each of the industries Forbes has picked their "Best of the Web" selection and provided a brief history about the company as seen in this example for Grainger.
Check out Forbes Best of the Web in B2B: http://www.forbes.com/bow/b2b/main.jhtml