Try http://www.mathcasts.org/db_calc/main_view.php . I just did a google search for a specific type of problem I was struggling with and this website helped a lot. I can't guarantee that all the videos are accurate, but there are lots of them(note that there are 6 pages) and they seem fine to me. Enjoy. Find the topic you are interested in and click "mathcast". Even though they are geared towards a specific textbook, its all the same stuff so if you are stuck on an topic, you may be able to find info about it here.