In that case, then, I shall mention them now!
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After the 1.8 firmware update, the PS3 can now output EVERYTHING at 1080p, 24Hz - DVDs and PS2 games being the ones most affected by this as Blu-ray is already outputted at that resolution.
I don't quite fully understand how the PS3 allows a 24Hz output, but I do know it's important for films (
http://en.wikipedia.org/wiki/Moving_image_formats) - films are iflmed at 24fps. However, TVs operate at 50Hz, 75Hz 100Hz, etc, numbers which it takes no genius to recognise are not divisible by 24. To solve this problem, every twelth frame of film is held on slightly longer, to make it 25fps. With such high quality film as Blu-ray, this can cause a stutter, which is sometimes quite noticeable. As the PS3 can output 24Hz, this allows film to be played as it should.
As for backwards compatibility... get the 60gb PS3 while you can. It's $100 cheaper than the 80gb version, and it contains the PS2 Emotion Engine and GPU, which allows for almost 100% backwards compatibility. PS3s in the rest of the world do not have the EE or GPU, and so rely on software emulation, much the same as the 360 (except that the PS3 software emulation is being constantly updated, and works for a hugely extensive games library).