Picture-in-picture has its uses, but unless you're watching certain freesat programs, the optical audio out only carries the same stereo signal as the standard phono audio out. Also, if you've seen IFC in action, you might not think it such a useful feature, the plasma screen not really needing this kind of enhancement in the same way as some LCD's do. The playback of HD camcorder footage via the SD card slot is undoubtedly handy if you have an HD camera.