Here is the information about free online courses from Standford and MIT in one place for your convenience.

http://www.class-central.com

Currently there are 16 upcoming courses. Go to the course website for more information about the courses and registration.

Please visit the following website for more direct information

Stanford Coursera: http://www.coursera.org/landing/hub.php

MIT's MITx: http://mitx.mit.edu/

MIT's Udacity: http://www.udacity.com/