Keyword development is key to any SEO endeavor.
Mining keyword searches can also be valuable in product development. With very specific product searches, users (i.e. potential customers) are telling you EXACTLY what products and services they are looking for.
Check out these resources. Each offers different insights into keyword search and trends.

WordTracker

Yahoo
Microsoft(beta site: includes […]

I heard on the radio today that office workers spend an average of 45 minutes per day looking for things on their desk.
Is there any hope? I think “yes.”
Occasionally a book shows up, steps confidently up to the plate, and hits one right out of the ballpark (replace baseball metaphor with one of your […]