Netpreneur

Google Alerts

The free Google Alerts tool allows you to receive email notifications when a page containing your specified keywords is indexed by the Google search engine. You can use this tool to learn when your own pages are listed, or when those of your competitors are listed.

Spyfu.com

SpyFu lets you see which keywords your competitors are buying and which ones they optimize their site for. Once you understand the competition, you can beat them at their own game or your can exploit their weaknesses.