e-Learning is short for electronic-learning and broadly refers to learning with any type of electronic tool or device. With the growth of access to the Internet, this term is more commonly used for learning online.
See http://en.wikipedia.org/wiki/E-learning

Popular eLearning Learning Management System solutions:
Moodle
aTutor
WizIQ
Edu20

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U.S.News & World Report maintains a database of articles about of an online E-Learning Guide.
See http://www.usnews.com/usnews/edu/elearning/elhome.htm