Just wanted to post this info from a website I found: On a PC with non-interlaced graphics, 720p would be 1280x720 and 1080i would be 1920x540. 1280x720 is a wide-screen (16:9) resolution. 1920x540 may seem like an odd resolution, but it takes up a screen space of 1920x1080 when interlaced. That's also a wide-screen (16:9) resolution. 1280x720 = 921,600 pixels 1920x540 = 1,036,800 pixels 1,036,800 - 921,600 = 115,200 pixels Thus, 1080i mode has 115,200 more valid pixels than 720p. If the number of pixels alone determines the better resolution, then 1080i resolution is better. However, if progressive-scan (non-interlaced) graphics is preferred over interlaced graphics, then 720p may be better since having 115,200 less pixels could be considered an honorable sacrifice to use a progressive resolution of 1280x720.