If you're looking for a Windows Phone app to add to your Kid's Korner, take a look at Kids Tube.
Each collection has a handful of videos with episode descriptions. Content is updated periodically and any updates are reflected each time you launch Kids Tube. Videos ran smoothly and the selection is nice enough to keep most kids... say under ten years of age...entertained.
Kids Tube is a free, ad-support app that you can find here at the Windows Phone Store. As an added bonus, the developer of Kids Tube has this discussion going on in the Windows Phone Central forums. Feel free to chime in on the discussion.