There's a great way to post a video from youtube.com on the forums right now. You can do it by using the [ youtube ] tags.
For example, you have this url: [Only registered and activated users can see links. ]
To post the video, use this:
where rqlaN31OzDs is the variable from the upmentioned youtube.com url
The editor will also help you with this button:
This tag was strictly added for youtube videos. It won't work with others.
If you have any questions, feel free to ask.