- Allied Signal
- Alltel
- AMC Cancer Research Center
- Amerada Hess
- American Dental Association
- American Family Insurance
- American Lung Association
- American Medical Association
- American Optometric Association
- AmerUS Life Insurance Co.
- Arkansas Bar Association
- Associated General Contractors of Illinois
- AVNET
- Axcan Pharma
- Blue Rhino Corporation
- CalFarm Insurance
- California Lutheran University
- Carle Clinic
- Caterpillar
- Certified Angus Beef
- Chick-fil-A
- Community Bankers Assn. (IL, GA, OH, WI)
- Connolly Consulting
- ConocoPhillips
- Consorta - Catholic Resource Partners
- Country Insurance and Financial Services
- Cybermation, Inc.
- Eli Lilly
- Elmhurst Memorial Hospital
- Equity Office
- ExxonMobil
- Famous Footwear
- Federal Express
- Foodservice Consultants Society, International
- Fujitsu
- GlaxoSmithKline
- Grain & Feed Association of Illinois
- Greater New York Hospital Association
- Greater Springfield Area Chamber of Commerce
- Green Bay Packers
- GROWMARK
- Harris Corporation
- Health Alliance Medical Plans
- Horace Mann Insurance
- IBF
- IBM
- Illinois Association of Realtors
- Illinois Association of School Administrators
- Illinois Health Care Association
- Illinois Hospital Association
- Illinois League of Savings Institutions
- Illinois Movers' and Warehousemen's Association
- Illinois Society of Association Executives
- Illinois State Dental Society
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- Illinois State University
- IMATION
- Indiana Credit Union League
- Indiana Farm Bureau
- Indiana Gas
- Indiana State Bar Association
- International Order of the Golden Rule
- International Truck & Engine Corporation
- Iowa City Chamber
- Iowa Foundation for Medical Care
- Iowa Independent Bankers Association
- KMOX Radio
- Lands' End
- Lawson Software
- Levi, Ray and Shoup
- Lincoln Financial Group
- Memorial Medical Center
- MetLife
- Micro Motion, Inc.
- Microsoft
- Midwest Propane Gas Association
- Minor League Baseball
- Mueller Corporation
- National Assn. of Mutual Insurance Companies
- National Precast Concrete Association
- National Rural Utilities Cooperative Finance Corporation
- National Wood Flooring Association
- Nortel Networks
- Ortho-McNeil Pharmaceutical
- Penn State University
- PGA Tour
- Phoenix International
- Prairie Cardiovascular Consultants
- Premier, Inc.
- Procter & Gamble
- Provident Bank
- PSI Energy
- Raynor Garage Doors
- Reliv, Inc.
- Rock-Tenn Company
- Southern IL University School of Medicine
- St. John's Hospital
- Standard Mutual Insurance Company
- Sun Microsystems
- SunTrust Bank
- The Gap
- Thomson Consumer Electronics (RCA)
- U.S. Cellular
- UBS
- United Airlines
- University of Illinois
- Vincennes University
- Wal-Mart, Inc.
- Zurich Insurance
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