Brian,
Cheddar is the technical framework that Don Marti worked up and shared with us at VRM day in April.
It's meant to allow non-stalking, not tracking based ads through, while barring other ads including those based upon tracking, buying and selling of data etc.
Read Doc's post here on the overall topic and Cheddar in particular.
Don,
Not sure if Cheddar has it's own site now to describe the framework.
Mary