I LOVE the DSi beyond all belief!
What color is? I know the Japanese ones are different.
Mine is just black. The only real difference I can tell is that everything is in Japanese. That, and the region lock on the DSiware. The manual is pretty funny to read too since the examples of what not to do are several pages longer than for the US manual and are pretty wacky.
Hhhmmm... Why would they lock it? Seems a tad pointless to me. Could be I don't quite get what you're saying.
But on another note, I want the next DSi to take screen shots of your game. And I would like a webcam for when you go online.