[kml_flashembed movie="http://www.youtube.com/v/YvO1xELHp3k" width="425" height="350" wmode="transparent" /]
My favorite was this one:
[kml_flashembed movie="http://www.youtube.com/v/Vn55ZdmBPJ4" width="425" height="350" wmode="transparent" /]
I have to admit the first is better for a general audience.