- AARP
- Aloysius, Butler and Clark
- American Cities Business Journals
- ACP/ASIM
- American Hotel and Motel Association
- American Medical Association
- American Red Cross
- Aon Consulting/The Loyalty Institute
- Blue Cross Blue Shield of Florida
- Blue Cross/Blue Shield Association
- BP
- CAP Ventures
- Columbia Gas
- Comcast
- Corporate Synergies
- CPCU Society
- Delaware Valley Grantmakers
- Delaware River Port Authority
- Delaware Valley Regional Planning Commission
- Duane Morris
- East Stroudsburg University
- ECS
- ECollege
- Econsult
- Electric Mobility Corporation
- Empire BlueCross BlueShield
- Employment Law Alliance
- Exelon
- Fidelity Investments
- First Union Bancorporation
- Ford Motor Company
- Friends Center City Retirement Community
- Friends of the Wissahickon
- Goldsmith Kahn Associates
- Guthrie Health
- Horizon Energy
- Houghton Mifflin
- Independence Blue Cross
- International House (Philadelphia)
- Identity Advisors
- InvestorForce.com
- ISI (Institute for Scientific Information)
- LevLane
| - Magellan Behavioral Health
- Mitchell & Resnikoff
- Mortgage Bankers Association
- National Automobile Dealers Association Guide Company
- National Parking Association
- National Penn Bank
- Network of City Business Journals
- Nilfisk
- OMG Center for Collaborative Learning
- Orion Consulting, Inc.
- PECO Energy
- Pennsylvania Gas Services
- Pennsylvania, Department of Environmental Resources
- Penn State University
- Pharmacia & Upjohn
- Philadelphia Business Journal
- City of Philadelphia, Recycling Office
- Pearson
- PGW
- PNC Bank
- PP&L
- Red Tettemer
- Redeemer Health System
- SEI
- SEPTA
- Simone Collins
- Temple University, Institute for Public Affairs
- Tenet Health Systems
- The Ohio State University
- Thomson Publishing
- Unisys
- University of Illinois
- University of Pennsylvania Health System
- University of Virginia
- Vanguard
- Wachovia Bank
- Weavers Way Food Co-op
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