To keep on topic to thread topic.. yes, geo-ip marketing is a great way to increase clicks and revenue.
Google took a license with Digital Envoy to be able to redirect people to the appropriate front page based on IP/country. They paid $8k/month for this technology.
Earlier this year, Digital Envoy and Google got into court issues where Digital Envoy saw that google was using the geo-up stuff to bring up advertising, which they felt wasn't covered under the licensing agreement, thus "losing" money on additional licensing while google was making millions.
see article here:
http://news.com.com/2100-1024_3-5200584.html
From the article, Digital Envoy is wanting a percentage of the ad revenue that was served up as a result of geo-ip targeting.
Google saw the value in geo-ip targeting of advertising, saw the application of the idea, and now Digital Envoy wants its cut.
Fight the Sticky Fingers!