It has been in the pipeline for some time now, but the Open University has now launched OpenLearn, a website which makes OU course materials freely available and provides "state-of-the-art learning support and collaboration tools" to boot. The selection of materials available at the moment is modest, and appears to be suffering from some teething problems (some courses have been noticed appearing and disappearing) but provides an interesting sample of the breadth of OU courses and looks like it could become a valuable site. I still have a year to go until I finish my degree, but afterwards I wouldn't be surprised if I look to this site for the odd extracurricular learning experience, as it were.
More broadly, I think this is great. Our tax pounds go to support the university system, including the OU (maybe not supporting it as much as it could, but that's a whole other story) and this has the obvious benefit of helping to educate the nation, but with the free distribution of these materials, I feel we are getting even more value for money. Sure, I still need to pay if I want to follow a course properly and get a qualification, but now I have the option of looking over the shoulders of the "real" students and get some benefit from well written study materials. I believe some other universities are also publishing course notes. Long may it continue.