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).
11 February 2009, 09:39 PM
Xhris
Re: MINI TUTORIAL: How to embed YouTube videos into forums
Additional info:
There are additional switch commands that can be added to embedded HTML code (used to embed YT videos in your site) to force the video to automatically play in high quality (HQ) or high definition (HD) mode.
Add to the end of the address:
• &ap=%2526fmt%3D18 for HQ (480x360)
• &ap=%2526fmt%3D22 for HD (1280x720 a.k.a. 720p)
Note that a video will only automatically play in HD with the above extension if the video was uploaded at HD quality, otherwise it will play in standard definition (SD)—which is poorer quality than HQ. HQ mode will always work however. Hence unless the video is HD or SD quality, the address should always have the HQ extension added to ensure maximum playback quality.
Also, see here for downloading high resolution YT videos.