MSNBC.com reports that a new report finds that approximately one in six students–about 3.2 million people–took at least one online course last fall. This development defies predictions that online learning growth was leveling off. The report, released by the Sloan Consortium–a group of colleges pursuing online programs–estimates that 850,000 more students took online classes in the fall of 2005 than in the previous year. This represents a nearly 40 percent increase. The previous year, the group had reported that the online learning trend had its peak…