http://www.techsupportalert.com/content/coming-soon-take-2400-linux-course-free.htm
EdX is an amazing web site that offers around 150 courses, from the world's top universities, which you can study, online, completely free. There are a variety of topics to choose from, as you can see from the screen shot below, and you can take the courses at your own pace. Just view the online notes and lectures when you want to, and many of them are ready for you to study right now. Just head to www.edx.org and register (it's all free).