AAA Cooper
 
ABN Amro
 
Ace Hardware
 
Allstate Insurance
 
Alltel
 
Anixter
 
AON
 
Baxter
 
Blue Cross Blue Shield Illinois
 
Caremark
 
Citibank
 
CNA Insurance
 
Commonwealth Edison/Exelon
 
Computer Sciences Corporation
 
GE Financial Assurance
 
Hewitt Associates
 
IBM
 
Illinois Secretary of State
 
International Truck & Engine

Metavante Corporation (M&I Bank)
 
MPC Products
 
Northwestern Mutual
 
Peoples Energy
 
Procter & Gamble
 
Rexnord Corporation
 
Rockwell Automation
 
SBC Communications
 
Sears
 
Shelter Insurance
 
Social Security Administration
 
SPR Inc.
 
SUNGARD
 
Time Customer Service
 
TransUnion Credit
 
United Airlines
 
US Cellular
 
US Department of Defense
 
Walgreens