For free classes that can lead to a good online education ....
Khan Academy:
http://www.khanacademy.org -- My brother introduced me to this, and all I can say is that Sal is awesome. My brother used it to master linear algebra. I'm using it to re-learn some physics and calculus.
MIT Open Courseware:
http://ocw.mit.edu -- MIT is opening all its classes, and many of these also have the lectures in video and audio. All are free. I read recently that MIT is working on a program that would allow people who have used their Open Courseware for study to get some sort of certifcation that they have learned it.
Academic Earth:
http://academicearth.org -- Video courses from Yale, Columbia, Harvard, Stanford, MIT ... I love this site, but wish the videos worked on the iPad. What I do is find a course I like, and then find its source at the school or in iTunes.
http://www.openculture.com/freeonlinecourses -- just found this, so I haven't checked it out much yet.
iTunes U!!! It's in your iTunes on your computer (or your iPad). I don't know if this started it, but it was where my eyes were opened.When iTunes U launched, I began with Thomas Sheehan's awesome course on Historical Jesus from Stanford, and truly enjoyed it. I wrote to Professor Sheehan to thank him (and to let him know that he had appreciative students that he's never seen), and he wrote back with more material and suggestions -- more personal guidance from the professor than I had gotten in some of my college courses. Stanford has some really good computer science courses, too, and lots more.
Now, what we do need is some nationally recognized certifications, like O-levels and A-levels, so that those HR people who can hire someone who doesn't have a piece of paper that says BS but who really is educated (and motivated).