OnlineUniversities.com is a curious website apparently set up in part to promote for-profit schools such as the U of Phoenix . I am agnostic to negative about that particular cause although I'm getting increasingly interested in quality alternatives to costly university educations--emphasis on quality.
Here is a cool link they sent me: Top 100 Ivy League lectures available for free online.
Update: Wow. ITunes U offers free access to 75,000 audio and video education files from top universities, museums, etc--literally a lifetime of learning.