Nintendo's DSi, out now in Japan, has finally been slated for US release on April 5th for $170. But you won't score one in white.
While the DSi is available in Japan in white and black, it will come to the States in black and blue. And at first glance, that blue is fairly nauseating. So as far as I'm concerned, the DSi is coming to the US in black (and blue at launch only if you don't pre-order it.)
Also of note, an American version of DSi's DSiWare (think WiiWare downloadable games but for the DSi) will be available for $US2 at launch.
AU: Before you ask, there's no word on Aussie release yet.