Class Central, a MOOC aggregation site, has posted a brief analysis on the growth of MOOCs over the last two years. There is currently over 900 announced courses being offered by more than 150 universities. They report that the humanities have edged out computer science/engineering to become the largest subject area of MOOCs. Additionally, while 52 percent of MOOCs are currently being offered through Coursera, there has also been an increase in new MOOC providers from from outside of North America.
http://www.blog.class-central.com/the-mooc-juggernaut-year-2/