I have just activated a new plug-in - Easy Video Embed which means should it's possible to add video from more than YouTube by just pasting the URL.
"We currently supports the following Tube video sources: YouTube, Glumbert. Google Video. Metacafe. MyVideo.at. Yahoo! Videos, Myspace, LiveLeak.,Revver, Vimeo, Guba, GameVideos, GameTrailers, Tudou (Single/Playlist), CollegeHumor, 5min."
Here's one I did earlier - and sent to vimeo.
[+] Embed the video | Video Download | Get the Flash Video |