Nintendo started shipping the new Nintendo DSi in Japan today. As reported the Nintendo DSi will not be available outside of Japan until next Summer. For hard-core Nintendo fans outside of Japan there is either booking a flight to Japan or buy the DSi at an Japanese video game exporter like Play-Asia.

The Nintendo DSi retails for about $192 in Japan. Play-Asia sells the DSi for $299 internationally.
Features of the new DSi include Enlarged screen 17% bigger at 3.25 inches, Reduced size (about 12% thinner), Camera function built-in (640x480), SD memory card slot (Allows you to save pictures and display them on the Wii), Built-in browser function, Built-in music playback function, Download and store games on your SD card (Japan only!), Plays all Nintendo DS games and does NOT support Gameboy Advance anymore.

The imported Japanese Nintendo DSi console comes in black or white, Power Supply (110V), and Manual (Japanese).
More details on Play-Asia.