Start here. Let us know what you find out.

Again, it's likely most mainstream companies don't advertise on ANY controversial show. This is a phony issue.

A list of Rush advertisers, national and local, from a year or so ago, from one of many "liberal" websites dedicated to annihilating all conservative talk radio:

Overstock.com
eharmony.com
Inverness Medical (maker of stresstabs)
Onstar
Sleep Number Bed
The Neptune Society of Northern California
Oreck Upright Vacuum Cleaners
Smart & Final
Mid-West Life Insurance Company of Tennessee
Blue-Emu
Lumber Liquidators
Avacor (hair loss treatment)
Lazerguide® (golf instruction tool)
Mission Pharmacal Company
General Steel Metal Buildings
Life Quotes, Inc.
Select Comfort Corporation
Scottrade Inc
RegionalHelpWanted.com, Inc.
The Swap Shop
Pfizer Inc
Lending Tree
Tarrant Books
Stewart Enterprises

I'm seeing ONE advertiser here that is also on that memo list. Eharmony.com.

For balance, here's a 2004 list of Howard Stern advertisers from a right-wing website that also thinks everything they don't like should be wiped from existence:

AAMCO Transmissions Inc
America Online, Inc.
AT&T Wireless Services, Inc.
AutoTrader.com L.L.C.
Comcast Cable Communications, Inc.
Outback Steakhouse, Inc.
Poland Spring water
Miller Brewing Company

None of these are on that memo list.