Here is how to geotarget YPN ads to US traffic only

[Andrew]

Check out this tutorial, just got it up and running on my sites:

http://www.websitepublisher.net/article/geotargetting-php/

One correction for the non-technical people, you need to enclose the actual script with <?php ?>

 

[Juicify]

Nice idea! Even though I don't use YPN it can be useful.

 

[dtang4]

Also, I'd like to add... after you determine the visitor's geography once, you should store that value somewhere (in a cookie or session var), so that you don't waste cycles reprocessing at each page view.