Embedding
Robert put together a tutorial on this way-back-when, I'll look for the link.
This is how I do it.
Copy the unique video number from the YouTube URL in the address bar. (Line one)
Paste that bit into the flash code of your post. (line two)
(picture no. 229 from the old board's gallery, not restored)
You can also use the flash code icon in your editor, but you'll still have to re-write the code to match this formula. Use the preview button to check your work.