You can read the report here: http://www.preknow.org/documents/CommonVision_Dec2007.pdf
A organization that I have never heard of called PreK Now has some interesting discussion on the matter as well.
One thing I know from my experience in the field: every state utilizes a different system of accountability, staffing, child care regulatory standards, and career ladder.
Which works best? Is a individualized state system better than something uniform accross the nation? Check out the report to find out.
I would say that we need an individualized system with parts that are familiar enough to be seen in other state systems albeit possibly under a different name.