It seems a long, long time ago that I was at the MoodleMoot before last held at the Open University. Around that time (and since, and probably before) the idea of a UK-based version of MIT's OpenCourseware was floating around - and with the announcement that the OU was going to use Moodle as its VLE this came closer.
The OpenLearn scheme has two main areas - the LearnSpace (for those who want to learn) and LabSpace (for those who want to use and remix the learning resources). The resources in LabSpace are available in IMS Content Packages, Moodle Backup format (see, I knew we were on to something...), RSS feeds, and OU XML feed and simple zip file backups of all the individual assets.
In common with the self-healing demo courses on the main Moodle web site, LabSpace has a PlaySpace where you can experiment with some of the materials, so... go play!