Hello All- Just thought I would throw my 3 cents out there regarding my strategy around YPN and Adsense. I've always felt that diversifying your revenue streams was very important, and so my goal with YPN was to increase my ad partner porfolio, not replace it. I am finding that YPN is filling a void for me that Adsense was not able to fill (I use the category targeting ads feature) so I am using them on pages I wasn't even running adsense in the past. I had some pretty high impression pages going to waste before, but now they are earning great using YPN. My advice, try targeting your YPN ads to the demographics of your target audience, and not neccessarily your content. I think it is a great way to compliment your Adsense ads (which are more relevent to your content) with ads that may be relevent to the type of visitors you have, providing more unique ads across the board on your site, and more revenue. Hope someone finds this useful... it seems to be working very well for me and I just wanted to share.
I think that is a pretty good idea. You can use it to complement your site and add other options for people who may not be interested in the adsense inventory.