This is very similar to what a local startup here in Ottawa is doing. http://dogoodhq.com/ http://dogoodhq.com/ , they replace your normal advertisements with c

This is very similar to what a local startup here in Ottawa is doing. http://dogoodhq.com/ http://dogoodhq.com/ , they replace your normal advertisements with calls to actions, green initiatives and campaigns from charitable organizations. They also have been nominated for a web award at SXSW for technical achievement I believe.