Freakonomics Blog: What Should be Done About Standardized Testing?

The Freakonomics blog at NYT has occasional 'quoroms' where they get a few experts in a field to opine on a subject. For the recent post about standardized testing, they had several, including FairTest's Monty Neill, who invoked NAEP:

NCLB’s testing mandates have flooded American classrooms with millions of additional tests. At the same time, the rate of learning improvement has actually slowed, according to the National Assessment of Educational Progress (NAEP).