Anthony Ha should have done a bit more research--and not admit he doesn't use the other site. Tumblr's bookmarklet is smart enough to discern where the media originates from. Ie. If it's youtube.com, it adds in embed code whereas if it's another video site it makes it a link.

That said, it doesn't have as much of a complete support of sites like Posterous does, so great job on the technical chain combo.