This project was an entry for Yahoo's OpenHack in New York. Yahoo Finance (and every other finance service) provides insider trading data days after the information becomes public. InsiderTrades.org scans the SEC's filing system every fifteen seconds and then alerts subscribers if their stock has been traded by an insider.
The only other source for this information (and not in real-time) is Edgar Online, a proprietary service that powers Google Finance and Yahoo Finance. InsiderTrades is completely free beer-wise and speech-wise.
Addy Cameron-Huff. I'm a Canadian law student at Queen's University and an H.BSc. graduate from the University of Waterloo. I make websites such as last year's HackU Waterloo entry and do contract programming to pay for school. Thanks for checking out my entry for HackU.