YPN have today announced policy changes – the main change being that you are now only allowed to place a maximum of three YPN ad units on any single page at a time. This is the same maximum that AdSense allows on a page at any given time (unless you have special permission to do more).
YPN Limit maximum number of Ad Units Per Page to 3
Problogger.net runs on the Genesis Framework
The Genesis Framework empowers you to quickly and easily build incredible websites with WordPress. Genesis provides the secure and search-engine-optimized foundation that takes WordPress to places you never thought it could go.