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
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PPC BidMax is an automated PPC bid management tool to help you manage your keyword bids in Google, Yahoo and MSN. Designed to save you up to 85% of bid costs this is a must have tool for PPC advertisers and caters for small to PPC Agency users.