Free online university courses / classes

Could be somewhere to start for those looking to cross train away from construction-related activities...courses provided from the top US universities as mentioned in this Businessweek article

http://www.businessweek.com/magazine/computer-coding-not-for-geeks-only-01262012.html


Here's a site with lots of such links
http://www.openculture.com/freeonlinecourses