Google Adwords for Market Research not just advertising!
For example we took over a large campaign for an offline business that was spending around $100,000 a year on adwords.
By going through each campaign and seeing which keywords were working and then creating content to turn up in the organic search area we halved this in a few months.
We can now target a number of other keywords and see which ones perform best and do the same thing again.
By using blogging etc you can create content around those performing keywords and get good organic listings reducing the spend for your client.
Quentin
My Favorite Charity .:: www.Unitus.com ::. Helping Third World Entrepreneurial Families Help Themselves.