I posted it in the TKD forum, but I thought perhaps the strikers at large might want to see this video. It is a great example of how to layer your sparring into lots of different situations to focus on certain aspects of sparring. I don't think I've ever seen a video that summed up good sparring drills better than this one, so I'm sharing!
http://www.youtube.com/watch?v=d8zBl_aBsj4