When Google Ad Planner launched I was really in shock and awe. Google has added a new feature to Google Ad Planner named the Google Ad Planner Publisher Center. It basically gives publishers a way to add more details about their site, so that advertisers can find their sites and better judge the traffic and demographics data of your web site.
To gain access to this, you need to be a publisher and you need to verify your site with Google Ad Planner. There are two ways to verify your site, the details on that is over here, but since I am already verified under Google Webmaster Tools, I can easily add them to Google Ad Planner.
When I logged in, I had no sites in my profile, but since I had sites verified with Google Webmaster Tools, I was able to add them easily to the publisher center:
I clicked on "select sites to include" and was presented with a list of sites I can include:
Then I am presented with an overview and a way to "edit" the information about these sites:
I clicked on edit on one of the sites and the screen looks like this:
Here is also a screen capture of the categories I can add my site to:
For more information about this Google Ad Planner Publisher Center, see the Inside AdSense Blog.
Forum discussion at WebmasterWorld.