Nearly half of distance-learning courses used by K-12 schools are given by college-level institutions, says a major U.S. Department of Education study released March 2. Nine percent of schools used distance learning in 2002-03, with 328,000 enrollments a year (counting some students more than once). Two-way video is the most popular platform, used in nearly half of school districts. A big PDF of the full 97-page report is available online.