I recently implemented some custom code that allows you to embed (rather than just link) YouTube videos on any OKCTalk forum.

Here's what you post:

{yt}TMQhxpOjDmM{/yt}


Where:

{} = [] (lower case of same key)
TMQhxpOjDmM = everything in the URL of the video after the equals sign


Here's an example: