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1080i and 1080p are both 1920x1080 so the resolutions are both identical. What's different is that in 1080p you get a slightly better image because all of the lines of resolution are delivered in a single pass, but this is only a real valid selling point if you are viewing 1080p material. Unfortunately the way things stand today *no* broadcasts to my knowledge are done in 1080p because of bandwidth concerns, the max broadcasts you will get are 1080i and this isn’t going to change for a long time. If you watch a lot of sports on TV you won't be noticing a difference between 1080i and 1080p TV's, but if you are watching fast-paced action movies on HD-DVD or Blu-ray with 1080p, on 1080p TV's you WILL notice a difference.
Also for those who want to save a few bucks the PS3 will output in 1080p (movies at least, not sure about games), it's among the cheapest Blu-ray players if you can get one at launch ($499 for the 'base' unit).
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