...how do you tell? I've only just begun looking into high def and, well, I understand that HD usually refers to a video format consisting of either 720 lines of progressive video or 1080 lines of either progressive or interlaced video... but how do you tell this? I mean the 23 and 30" models say HD...but it only gives resolution... ..I know there's a really easy answer to this (probably) but right now i'm lost. any smart HD savvy people want to tell me? thanks.