According to the dev I just spoke with, XF should support a large number of embedded videos, not just YouTube. YouTube is standard, but now we have the following:
BET
BlogDumpsVideo
BlogTV
Bungie.net
CNN iReport
Clipfish.de
Clipmoon
Clipshack
Clipsyndicate
College Humor
Comedy Central
Crackle
DailyMotion
Espn
Facebook
Funnyordie.com
G4tv
Gametrailers
Goear
Google Video
IGN
Izlesene.com
JibJab
Joystiq
LiveLeak
MaYoMo
Mail.ru
MarketNewsVideo
Mefeedia
MegaVideo
Metacafe
Mevio
Mpora
MySpace
MyVideo.de
Novamov
NyTimes
PBS
Rambler.ru
Reuters
Rutube
SchoolTube
Sevenload
Stagevu
Stream.cz
TNT
Tangle.com
TinyPic.com
Trophy-clips.com
Trtube
Twitvid
USteam.tv
VH1
Veoh
Vimeo
Worldstarhiphop.com
XFire
Yahoo
Youku
Youtube
justin.tv
Now, Some of these I have no idea what they are or why we'd need them. But there are some good ones in there. According to the instructions:
The user does not have to use any media tags at all. Just enter the link of the video sharing site inside a post and the media player will auto embed into the post.
Still won't let me put in the Trine 2 trailer: EDIT: Trying to put the video in by clicking the media button and entering the URL there doesn't work. Just putting the link in the text auto-converts it to video. I don't like this, as sometimes it's better to just have the link than embed.