These resources are clearly biased for or against genetically modified foods. Treat them accordingly.
Genetically Engineered Crops - The Center for Food Safety
Ten Facts about GM foods - Greenpeace
Genetic Engineering - Seirra Club
The bias in these resources is obvious, but bias is not always so easy to detect. Always read your resources critically to determine any biases the author may have.
AgBioWorld AgBioWorld Foundation
BIOtechNow Biotechnology Industry Organizatoin
Council for Biotechnical Information