Lessons I'm learning from this is that it is OK to monetize your site with Adsense only.
Insofar as what has happened to me, incorrect, yesterday's AdSense for me was 50% of post-Panda 2.1 and to put that into context 20% of pre-Panda 2.1
I'm seriously considering the removal of Adsense off all my sites and FWIW my traffic yesterday was the same as all this week yet AdSense is down 50%...and some people reckon Panda has nothing to do with AdSense!
My earnings' graph clearly shows a huge drop with two Panda iterations. It's very obvious to me from where Google's extra profits have derived.