I heard that some HD-DVDs are hybrid, having a DVD side. One side is HD-DVD, and one side is DVD. This interests me because I could start buying these hybrids and begin an HD-DVD collection while still being able to watch the movie in my normal DVD player until I can afford an HD-DVD player. But not all HD-DVDs are hybrid. What do you think? How can you tell if it is hybrid before you buy it?