MagiK, don't believe what Monsanto tells you, or the FDA. The FDA is clearly a "captured" agency - meaning it has simply slept with the industries it regulates way too often to be disinterested.
Here's an "out there" site for you that states some credible stuff:
http://www.stopcancer.com/FDAscandal3.htm
(note that it costs more than regular meat).
Here's how consumers view it:
http://organicconsumers.org/irrad/beefbust.cfm
Sometimes general common sense is best.
Here is the exceedingly credible Humane Society's take on it:
http://www.hsus.org/ace/14976
Quite simply, irradiated e.coli-infected meat doesn't come 100% clean.
Plus, why can't we just eat food the way mother nature made it, for crying out loud? Is that so damned hard?