iPhone Firmware 2.0 supports Japanese keyboard

iPhone Firmware 2.0 supports Japanese keyboard. Here's a video posted by TokyoMango that shows the Japanese keyboard from the iPhone 2.0 firmware. Tokyo Mango describes the input method:

You can pick from a muti-tab style kana keyboard or a sliding keyboard. Japanese kana letters are organized in groups of five according to a beginning letter and corresponding vowels (a i u e o), so you can either put in the first letter and then hit the same key b/w 1-5 times to get the right sound, or you can put the first letter in and then scroll through to see all five sounds and pick the right one.

iPhone Firmware 2.0 supports Japanese keyboard Video

(source)