EDIT: This should be dead now.
For today only, August 4, there will be 5,000 coupons for free Freschetta pizza given away every half hour until 4pm est. That means there should be another, what, 35,000 coupons? I think that's right. Obviously these are going to go lightning fast. It'll most likely be luck of the draw, but if you're tied to a computer all day anyway, might as well try your luck.
In the mean time, you can watch a live video on their site by some guy who loves pizza. How do you get a job like that? This seems like something I'd be perfect for. I stand around talking to an invisible audience about pizza all the time and I've never been paid a dime for it. Is there an equivalent for freebies? I could do that too!