RADIO
The Radio Ad Effectiveness Lab conducts an annual study on the effectiveness of radio advertising. The report is called Radio’s ROI Advantage and focuses on the advertising—Return on Investment.
Their 2005 study found that during the four-advertiser six-month test in “the real world” Radio delivered 49% better ROI than television.
You can download the complete report here:
Complete report:
Executive Summary
INTERNET ADVERTISING
Here are papers/websites that talk of response rates for internet advertising
Internet Advertising Revenue Report
TELEVISION
Listing of researches done on effectiveness of TV ads