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Don't know if these are old or new.Go to http://www.microsoft.com/games/halo2/ and click on Media. Then clicky on the Map tour links xD.Short, but they show parts of the maps.
Lazy
Already been posted, but interesting nonetheless.
What it is.
^hmm, i haven't seen that thread, and i am someone that usually checks these forums daily. Unless you mean that the site has been posted already. But those map tours seem pretty new. Although those didn't really show much...