Welcome to a Wikivid entry, consisting of a series of free Cinema 4D video-tutorials, covering a broad spectrum of the program-related topics, from very basic to advanced levels. It is open to editing and free to use for everyone, just like any wiki. This could be undoubtedly a great resource for Cinema 4D users, especially if more people get involved.
Link: http://wikivid.com/index.php/Cinema\_4D