Of course some topics are more amenable to go "online" than others, and for the time being you cannot - most of the time - get much in terms of actual "credits".
But this is not important - at least for me - so I am really thrilled by the possibility to pick what I like or what just looks interesting.
Have a look at Class Central - A complete list of free online courses offered by Stanford, Coursera, edX (MITx + Harvardx + BerkeleyX), and Udacity. It is the best way to see what's online and what is becoming available.
Here instead you can find a list of places to check for reviews of online courses (written by people who has actually taken the courses).
The people at CourseBuffet examine and classify courses according to a specific classification system, showing the approximate level a course would be at a traditional university and which courses are roughly equivalent.
Many people seem to find the (usually strict) schedule very difficult to keep up with. Personally I have found out that I can manage at best one course at a time but I really shouldn't take two overlapping courses.
Game Design Concepts
Stunt Writing for Personal Growth
Artificial Intelligence Planning
An Introduction to Operations Management
93.7% with distinction