Vonage the Broadband Phone Company, affiliate program pays $40 per sign up.
Great incentive, because those you refer get a $40 discount coupon
http://www.vonage.com
Vonage is also getting some good mainstream press, like Howard Stern radio show.
My Long distance used to creep up to about $300 monthly, until I got Vonage. Now I pay a flat $39.95 for Local, and Unlimited calls to anywhere in USA and Canada.