Canon offers lens tips with Change your lens, change your story
Canon UK has started showing a range of video tutorials based around the choosing of lenses for different subjects, such as macro, landscapes, portraits and wildlife/sports. They're hosted by Rob Grove and Jenny Hare, and they talk intelligently about the subjects raised and the equipment used. There's a interesting section on technologies and optical heritage too. The tutorials can be found here, but it takes a little while to load, so please be patient.