Hi again - I've fixed your YouTube embeds back through October 31.
The problem was a missing = sign in your embedding code.
For example, you had something like:
[youtube http://www.youtube.com/watch?v=Ms4JLAKalYw&w=560&h=315]
...but that should have been:
[youtube=http://www.youtube.com/watch?v=Ms4JLAKalYw&w=560&h=315]
If you don't need to specify a width and height, you can also simply place the YouTube link in its own line, without the shortcode, like this:
<br />
http://www.youtube.com/watch?v=Ms4JLAKalYw
More about YouTube embedding here:
http://en.support.wordpress.com/videos/youtube/
Just let me know if you need any further assistance.