Muy Thai has a great move where they deliver a airborne knee to the chest as they pull down on the back of the head with both arms. They followup with a one/two elbow strike to the side of the head which is similiar to five swords in kenpo.
For those of you who haven't incoporated MT into your programs it's high time to get on the stick.
The Muy Thai roundhouse is devastating and is easy to do. It works great on the legs and the ribs particularily the floating rib.