Pretty cool, especially as one can change "O Particle" to "wo" if desired. Saves on typing ;) Mind you, it took me a few minutes to work out how to switch on Katakana. Two suggestions: Extended Katakana syllabary would be really useful, as its the part I know least well, but its widely used. Mixed tests of Hiragana and Katakana. They're mixed in everyday usage, so I should be able to make the test really hard for myself ;)