Here is an excellent article written by Stephen Downes and published in eLearn magazine. Downes does a great job summing up the development and current state of e-learning, while anticipating future directions. There are many important trends highlighted here and most are linked to additional sources. The article itself strikes me as a good example of hyperlinked learning — using the power of the web to inform, open doors, and provide a pathway for user-centered, active learning.
Link: eLearn: Feature Article.