Mark - Was it in your presentation that the topic of free online learning was discussed? I seem to recall one speaker telling us that some universities offer their content free, but you pay for certification? Was that you, and if so, can you point me in the right direction to find out more please?
Open University's OpenLearn is very good for a wide range of subject areas. They also have a development site where you can customise existing materials as long as you allow other people to use the content afterwards.