I've had several problems converting all my ads from Adsense to YPN because of targetting and lack of variety. Today, with Google stats up to date and Y! stats as of 8pm pacific, Y! has earned more already on my rotating comparison test pages than Google, with code on about 1/7th to a 1/10 of the pageviews that Google has on that test.
Great work Yahoo! Hoping to see a few more improvements until you've caught up to Adsense on the important points. But you're definitely getting there.
After my first post on this thread I moved another 20% of my pages to YPN. They have outperformed Google from what I can tell and a funny side effect. For the first time smart pricing seems to have kicked in for the positive today and my Google income is higher on 20% less traffic. How Bizarre. Maybe if I remove all my Google code except for one page I'll get my best ever Google income? LOL.