PPC Spy Tool

If you are looking for a free PPC spy tool, check out brad callen's PPC Web Spy. It is a IE and firefox plugin that can display your competitors ppc ads. Only simple installation required. PPC Web Spy basically allows you to spy on your competitor's pay per click ads. you can spy on what keywords your competitor is using as well as their adwords copy and landing pages. There is no cost and it is free for the basic version.