The Library and Archives Canada now has its own channel on YouTube. They only have ten or so videos posted at this point, but more are sure to come. Among those available, you can watch a video on seaching the website as well as one giving an orientation of the physical archives, and another is available on the subject of immigration.
If you have a YouTube account, this is a channel you will want to subscribe to. Check it out at http://www.youtube.com/user/LibraryArchiveCanada/