I found that odd that the stylus was on top do you think it wil work better or worse that way?
Also what is that thing that I boxed in red that is not the stylus? I thought it was a usb port but, that would be a small usb port.

The DS Phat Stylus was on top though. Not much of a problem and it's better if you lose them a lot I guess because the right side won't feel incomplete if you lose your stylus.

I can't really tell in that lighting. And I wish they kept the stylus where it is.

I heard that is the 3DS infra-red port.

Looks like a IR sensor. I believe you'll be able to use the 3DS as a Wii Remote. For what? I have no idea.

... Or to allow for more peripherals to be used, like the DS's walking pedometer.

Do people really care where the stylus is stored? What difference does it make? It doesn't in any way affect how the stylus is used.

Maybe to connect your Miis to the system so you dont have to remake a mii if you have one you like already
sorta like the Wii Remote that holds a mii and you can take it to your friends house.

Yeah, that's definitely the IR Port. I guess it's used for the future Pokewalker (With the Pokewalker, they had to put a IR Port directly into the game card for it to work), Simple Trading an Transfer (it would probably be faster than doing it Wirelessly), and whatever else they want to use it for. I think it would be awesome if I could use the 3DS as a remote control for my TV. They have iPhone Peripherals that let you do that, what about the 3DS using what's built in.

@HiroshiYamauchi: Actually, that would be impossible with just an IR Sensor. See, the Wiimote actually has a tiny low-res camera inside, which sees the IR lights of the sensor bar as if they were normal lights (if you ever recorded a sensor bar with an SD Camera, you'll know what I mean). It sees these lights and figures out where it's supposed to be on the screen, and sends this information to the Wii. You couldn't do that with just an IR sensor. Plus, it would seem awkward to point at the screen with a handheld, especially with the receiver area at the side, rather than in the middle.

[quote=Otaku]Maybe to connect your Miis to the system so you dont have to remake a mii if you have one you like already
sorta like the Wii Remote that holds a mii and you can take it to your friends house.]
You could do that wirelessly, through the Mii Channel, even already to a DS using Personal Trainer: Walking. Besides, do you see any IR sensors on the Wii? (Note that the Wiimotes don't have IR sensors like I already mentioned).

It is a USB port. If you look closely you can see a small picture of a USB connector.

I think it's good that the stylus is on the top because my DSi is only one and a half years old and I already pulled the stylus in and out so many times that the little bump on the stylus that holds it in the DS has worn off and the stylus would just slide out of the DSi everytime it was tilted a bit. (Luckily I had 2 extra styluses...styly...touchpens.)
So I think it's good that it's on the top and also it'll probably be easier to change from button to stylus gameplay because you're index fingers are up there at the shoulder buttons anyway.

Edit: I searched for other pictures of the 3DS from the back but it's surprisingly hard to find any pictures at all even the pictures from the front are rare on Google search because it's still swamped with all the fakes.

But I did put the picture in gimp and played around with the brightness and contrast settings and it definitely looks like a hole, so not an IR sensor. But it doesn't look like a USB port and Mickeymac must be hallucinating because there's no USB symbol everywhere.

And besides Nintendo already listed the 3DS Input/Output features and neither USB nor infrared are listed. And the fact that all USB ports have to have the USB symbol on them and infrared sensors have a black shiny plastic over them I can definitely say that the mysterious part doesn't have any of these things and therefore remains mysterious (maybe until we find a better picture of the top of the 3DS).

It's the infrared port.

Why cant it be on the right side?

Because I'm a lefty

Where do you all get that idea. Nintendo never said anything about infrared and why would they replace their Wi-Fi with a method that needs direct aiming at another infrared port which would also only allow two consoles to interact.
Wi-Fi lets multiple players connect even if you're in the next room.

Is that the motion sensor?

Maybe it's one of those expansion ports that Ninty puts on consoles and never gets any use outside of Japan. =)

Look, Nintendo did say something about it. It was in an interview I read with someone who was working on it. And what makes you think that Infrared would replace wireless? It's there for things like a future Pokewalker (They had to put an IR sensor in the Pokemon HeartGold and SoulSilver Game Cards for the Pokewalker, and in the interview the guy explained they put the IR sensor there so they didn't have to do that again). Just because they had an IR Sensor on the Gameboy Color did not mean it replaced a Link Cable for Multiplayer, did it? I wish I could link to the interview, but I can't seem to find it.

Ugh, I don't like the stylus spot. I prefer the DS lite/i area, it's much more convenient.

But really, I just want a stylus spot that doesn't wear out and drop your stylus easily. My DSi is on the verge of beginning to do that.