Perhaps a kind of follow-up to the HD DVD vs. Blu-ray video. This was Sony’s attempt at their own kind of disc media for the PSP two years before Blu-ray came on the market. It was a small disc in a plastic case to watch movies on the PSP. I think this would be interesting just to show how companies can miss the mark when designing a product and how a product could be popular for such a brief period of time and then just fade in obscurity.