In this 15 minutes video Anthony Gucciardi is interviewing Dr. Edward Group M.D. They are discussing the top 10 GMO food list to avoid when shopping or otherwise.
Corn is the biggest problem and anything made from corn (fructose syrup, corn chips etc.)! Big problem is also meat- most animals are fed with corn (Genetically Modfied corn). Problem is also dairy, since most cows are fed with GM grains.