I'm sitting with the posts about this being kinda dumb to do.
They should: make the circuitry smaller and make the internal stuff take a smaller space if they can, but then they should replace that space with more battery instead of shaving off about 3 credit cards' thickness which doesn't mean anything, anyway, other than you can stick 3 more credit cards into your pocket.
This thing is thin enough the way it is, and making it thinner is just a gimmick. Any thinner, anyway, and it will be thinner then the width of the headphone plug, and end up starting to look like this thing:

With a jack wider than the player, what's the use of making it thinner? Saving plastic? Enough to make 1 more front cover after 1000 are made?
Anyway, that's my view. I guess it won't matter too much to me, since I'm gonna pull a madman and use a large external ipod battery to get as much time as I need for a week's use. Let's hope they don't downgrade the already crammed circuitry to make the player that tiny bit thinner.