> Check out Study Jams .. there are math videos on a variety of topics. Content is from USA so watch out for place value and seeing comma’s and saying “and”. Otherwise looks like a great way tool for math.
> If you are looking for media (pictures, music or videos) that you want to post on your blog here is an excellent place to search. Wikimedia Commons is a place where you can use/re-use any content that is on the site. Always a good idea to add attribution.