Keyword Eye

http://www.keywordeye.com/

Nearly 50,000 users throughout the world are using Keyword Eye, and the numbers are growing constantly. This tool is allowing competitor research for keywords along with giving suggestions and even giving you access to the questions people are asking. You can have a team of 10 members working together on the same account and sharing the research they conduct. This is a powerful tool for SEO marketing firms.

Keyword Research