The Prevalence of online education

The National Center for Education Statistics (NCES) conducted a distance education study based on the 2001-2002 academic year at 2-year and 4-year Title IV (Federal Student Aid)-eligible, degree-granting institutions. The study reported that 56 percent of all institutions surveyed offered distance education courses. The study also found that public institutions were more likely to offer distance education than were private institutions.
The Sloan Consortium, based on data collected from over 2,200 colleges and universities, reports that nearly 3.2 million students took at least one online course during 2005 (a significant increase over the 2.3 million reported in 2004). According to the same report, about two-thirds of the largest institutions have fully online programs.

Source: http://en.wikipedia.org/wiki/Online_degrees