Video online is a fantastic tool to get your library out there. You can show people, rather then just tell them. Youtube is an amazing site - it could be such a time-waster though! There is so much to look at that it is easy to get distracted. Embedding a video into your blog could cause its own problems though, it may slow everything down so much that people wont bother waiting for it to load. I started to look at lots of things today that simply take too long to load, and i found myself clicking off the page and going somewhere else.