Learn Programming Online, For Free: 75+ Open Courseware Collections from the Ivy League and Beyond
I read an interesting post at Your Daily Dose of WWW Goodness
The two authors went on a search to find online FREE resources for the most common and the most popular programming languages. They discovered that you can learn every computer language known to mankind online through open source projects, free online tutorials, free eBooks and wikis.
The downside to these tutorials is that none of them offer college credits nor do they offer certifications.
Their computer programming languages list shows the most popular sites rated in search engines through the keywords of the language + free tutorials or the language + free courses.