Chris Rickert:

Nearly 30 percent of the students at Madison’s Marquette Elementary School were classified last year as “talented and gifted,” or TAG, according to the school district.
That may not be Lake Wobegon territory — where “all the children are above average” — but it’s still pretty hard to believe.
Such alleged widespread student giftedness isn’t just the case at one district school.
Yes, there are wide variations among Madison elementary and middle schools in percentage of TAG students, but figures from the district suggest that on average districtwide, there are about twice as many TAG students as one would expect given national averages and expert opinion.
The National Association for Gifted Children estimates that about 6 percent of American school children are gifted.
The federal government’s National Center for Education Statistics put the gifted and talented number at 6.7 percent as of 2006, the most recent year for which data are available.

Much more on “talented & gifted” programs, here, including a recent parent group complaint.