Here are a number of sites which offer free learning opportunities. Most are in the form of recorded lectures (video and audio). Some enable you to download the lecture to a mobile device so you can learn on the go.

www.OpenCulture.com/freeonlinecourseswww.YouTube.com/eduwww.Apple.com/education/itunes-uwww.ocw.MIT.eduwww.oyc.Yale.edu