1. Watch the YouTube video you want to embed, and copy the text in the "embed" box on the right of the video (See pic below), e.g.:
<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/PMJmqxl_eqM"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/PMJmqxl_eqM" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>
2. In TalkGraphics, you embed the YouTube as a Flash object. In the text editor, add the usual line of code for embedding Flash objects, e.g.:
3. Replace "http://site/path/file.swf" with the video link given next to the "value"-text in the YouTube text above (shown in red). It should read:
4. Change the width and height to the YouTube values as shown in the YouTube text above (shown in green). The final code should read as:
(This is one of Xara's official videos.)
There was once a time when I tried to push greater use of videos in the forums, but it was at a time before YouTube was so widespread. It involved using screen recording software (or Windows Media Encoder) as originally discussed here, and then uploading to the site, clogging TalkGraphics's servers. This way lets YouTube's servers take the weight. Other legacy video related discussions: 1, 2 - including a video done personally by Charles Moir.
An example of a good use of videos is given here (video - I won't embed here, as it's not my work).