Here at the BHDD we use ALOT of coupons! Our entire monthly grocery budget is 600 and that is for 5 adults AND a baby!(mine of course) And no one goes Hungery around here! SO for out couponing needs we do ALOT or research and I personally like this site!
http://www.coupons.com/alink.asp?go=13903xh2010&bid=1313970001
They have TONS of exclusive coupons and there site is SUPER easy to use!