I've made a small enhancement to make it easier to include externally hosted media, such as Youtube videos.
There's an example at Doug's snowy posting, which I edited to embed the videos, rather than simply link them.
In the toolbar there is now a new button :
This lets you insert the path to a video or similar and then it will embed the media, rather than link to it.
It's not limited to videos. Try all sorts of things like tweets:
It supports any site using oEmbed which is most things, but not everything.