I was just thinking the same thing.
I just wish I could experience that much definition... my eMac chokes on 720. Heh.
I was really surprised that once that display was hocked up viewing HD content now only stressed my G5 only 32%. I then went onto Google and did a search and found out if you use the new HD displays they have a HD video processor in them (not just Apple displays). Now I have no problem watching HD content. You may have a different experience depending on your own computer.