The National Corn Growers Association provides a large index of corn products.
The most devastating product may be the Sheetrock Brand Gypsum Drywall Panels. Sheetrock is so commonly used in the construction industry that "Sheetrock" is synonymous with "drywall" (much like "Kleenex" is with "tissue"). Thus, there may be a significant amount of corn in the walls of most buildings.
Update: Charlie Byers, the manager of Product Safety for USG, was kind enough to give more details on the use of corn in their drywall in an e-mail. "Typically corn starch is used in the manufacture of gypsum panels as the adhesive that holds the face and back papers to the core of the panels. The corn starch is considered a primary ingredient and the purpose it serves is essential to the structure of the gypsum panels. The amount of starch used is about 3% by weight of the total. Depending upon supply and market conditions other starches such as potato, wheat, and beet may be substituted for the corn starch."
Here is a list of some brand names for corn products, in addition to those mentioned earlier:
Bio/Biocorp products (disposable cups, plates, straws, bags, cutlery)
Biota Spring Water
Blair Products for Artists
Burt’s Baby Bee Dusting Powder
Duracell Procell Batteries
EveryReady ClassiCarbon Zinc Batteries
Generations products (comforter, fiberbed, mattress pad, pillows)
Gerber Skinnutrients Baby Lotion
Gerber Diaper Rash Ointment
Gotta Go Kitty Litter
Match Light Charcoal
Nature Boy & Girl Diapers
Palmer paint products
Palmer’s Diaper Rash Cream
Prang Paints (finger, powder, premixed, watercolor)
Triple Paste Medicated Ointment (for diaper rash)
USG Ceiling Panels (same company that makes Sheetrock)