Acceleration/Grade Skipping
The subtitle is a bit of a put-off for schools, but this is the premier research on academic acceleration of gifted students including skipping grades. It is now available in "international versions" translated into seven languages other than English.
Academic Underachievement
Brain Development in Gifted Children
Curriculum/Academic Decisions/Schooling Approaches
Results of a 2-year effort by a National Research Council (NRC) committee to examine programs for advanced study of mathematics and science in U.S. high schools. The committee focused on the two most widely recognized programs in the United States, and the only two of national scope: Advanced Placement (AP) and International Baccalaureate (IB). The committee also identified alternatives to IB and AP and addressed specific questions about advanced study...
Numerous studies linked on Hoagies' Gifted website
2008 Report from the U.S. Department of Education
State by State Information
Data on the state of gifted education throughout the US. 2009 report.
Testing: IQ & other Ability tests, Achievement
Twice Exceptionality (Gifted with Learning Disabilities)
Psychology in the Schools, Vol. 38(5), 2001