5min
VideoJug

VideoJug and 5min are the the video versions of How Stuff Works. They both help to answer day-to-day questions. In my opinion, VideoJug has a nicer user-interface as well as a larger library of content. However, I would keep both in mind; if one doesn’t have the answer to your question the other might. Both sites are still in beta. The competition should be good for the reader/viewer.