Alice showed me how to input japanese text on my mac... and it's so easy, it should be criminal. I don't even have to know the proper hiragana or katakana (or kanji, for that matter): all I have to do is type the romanaization, and MacOS automagically translates for me into hiragana (for lowercase romanji) or katakana (for uppercase romanji). I can then hit the space bar to bring up a menu that lets me pick among kanji versions of what I just typed, but I could get in trouble with that unless I know what the kanji characters mean.
Wow. I love my Mac.