I came across a post on the Digital Surface blog that had an interesting example of using BEML to dynamically load in controls that are overlaid onto the video display. The result is a very innovative and aesthetically pleasing experience for watching and navigating video. Pretty neat!
Check it out here: http://blog.digitalsurface.org/blog/_archives/2009/2/2/4078596.html
We'll be posting an article and source code for the player so that you can download and play with it.