Just to clarify for everyone, to embed videos, you do this:
Take the video you want to embed
http://www.youtube.com/watch?v=QMfGqRUyrWw&feature=player_embedded
Chop off everything except for the string of random letters/numbers
QMfGqRUyrWw
Then put that string of characters between the YouTube tags
[ youtube ][ /youtube ]
(without the spaces)
Then you get this!
I’ll probably edit the OP with instructions to make this easier for people.