Over 800 scientists signed a petition, open letter to the government published in Institute of Science in Society ( http://www.i-sis.org.uk/list.php ) to stop distributing GMO for at least 5 years, to allow for more thorough testing.
http://rense.com/general80/haz.htm
http://www.naturalnews.com/040447_GMO_biowar_food.html
http://www.the-scientist.com/?articles.view/articleNo/32744/title/Anti-GMO-Study-is--Inadequate-/
http://www.grain.org/
http://www.naturalnews.com/037289_Monsanto_corporations_ethics.html
http://www.responsibletechnology.org/