Oh, Feynman.  Universal crush of physicists, and excellent talker.  In his series of Messenger lectures, he discusses physics as a whole.  Although it doesn’t go into technical details, it’s still a lovely series to listen to.

Video link: http://research.microsoft.com/apps/tools/tuva/index.html

Another one of Standford’s fully download-able courses: the study of Fourier transforms and their applications.  The courses starts with Fourier series and then goes on to develop the Fourier transform and its applications.  At 30 hour-long lectures, this series appears to be a full semester worth of material.

Video link: http://www.youtube.com/watch?v=gZNm7L96pfY

Average video length / Total series length: 51:16 / 25:38:03

Video download link: see bottom of video description (.mp4)

Nine lectures are in this lecture series, which is the first in six physics series from Standford.  Covered is the most commonly known physics: classical mechanics, also known as Newtonian mechanics.  Each video in this series (as well as the five other series) are available for download, as to allow for offline viewing.  To get to the subsequent videos in this series, follow the links in youtube’s suggestions.

Video link: http://www.youtube.com/watch?v=pyX8kQ-JzHI

Average video length / Total series length: 1:38:10 / 14:43:23

Video download link: see bottom of video description (.mp4)

There are two videos in this series, both discussing introductory information theory.  I suggest letting the video player get a hold of itself for a few minutes before playing to avoid buffering issues.  The lecturer featured in the linked video has made available for free download an extensive information theory text (.pdf is approx 11 MB / 640 pages.)

Video link: http://videolectures.net/mlss09uk_mackay_it/

Average video length / Total series length: 1:31:07 / 3:02:14

Book download link: http://www.inference.phy.cam.ac.uk/mackay/itila/book.html