Here's everything I know about the DS, ya might wanna add this stuff to the top post. Here we go~
DS Download Play:
Very cool feature, if you are near another DS which has a game in it that you don't have, you can press 'DS Download Play' and it'll be beamed into your DS. Only thing is, if the DS with the game goes out of range, or you turn your DS off, the game that was beamed in isn't saved. But, that's why they have...
Sleep Mode:
Say you wanted a game you beamed into your DS to stay, you'd put your DS on sleep mode so you don't have to turn it off, but you might want to plug it in, because it'll shut off when the battery dies.
Standby Mode:
EXACT same as sleep mode, except the it turns on when another DS comes in range.
PictoChat:
IMO, PictoChat will definatly raise the sales. You can see if any other DS units are online and if they are, you can use an on-screen keyboard or an on-screen drawing pad to draw/type to the other user.
802.11b:
Nintendo DS will be usable with a 802.11b wireless router sometime in 2005, rumored to use something called "DeMasked". Think of the possibilities, you can play against people all over the world!
LAN:
For multiplayer games, the DS could use a LAN to connect everyone instead of it's wireless reciever/transmitter.
Linux:
There is a group working on trying to get Linux onto the DS, like they were with the XBox.
https://dslinux.com
More later