I would've thought for a major version update of iTunes, it would be 64-bit; it's not like there are that many new features or drastic changes in it, except for Ping, which look really interesting. I'll have to wait and see if it catches on with me, but I can easily see it catching on with teens

I'm not sure about the new Nano, but kudos to Apple for yet again going for a radical new design to keep the line fresh and the competitors in the back foot. I liked the previous Nano as it fit in the hand nicely; I have the previous Fat Nano, which I love and have no real desire to "upgrade".
Nice upgrade to the Touch tho
The HDR photography is spectacular in my view; I was listening to a podcast recently talking about the photo capabilities of the iPhone, where they basically said it is the best phone-camera out there, being close to many instant cameras given the small fixed lens. The main gripe was the blown out highlights, which is common in phone cams. They pointed out some great photo apps, one of which was an HDR one. I thought if only apple would by it and integrated it as standard, though I figured they would probably implement it themselves. Which it seems they have.. making the 3rd party app obsolete.
I'm not a gamer, but the App Centre sounds like a pivotal move, and obviously designed to head Microsoft off at the pass, as they are aiming WP7 squarely at games and integrating their Live services. Everything else MS is doing with WP7 seems to be a clone of iOS, including their app store strategy, so why shouldn't Apple take them on in one area they have excelled in the Console business. Now Google has to do the same, if only they could standardise their apps for all the different Android phones, all while fending off Oracle over their stolen IP in the reverse-engineered Java knockoff Dalvik.
Not sure about whether I could use an Apple TV, but it looks like they've given themselves a much better chance of a breakthrough now, with a decent interface and pricing. No PVR, but that's ok, it is not a digital box. Maybe Apple could make a bigger brother if this one takes off, a complete digital box with PVR and Flash drive. Imagine that.