I just looked over the Facts Page (link below for others) and I'd like to know if both Hiragana and Katakana writing will be supported in the future. I remember a while back that this came up, and the answer was "no", but it says "we are augmenting our stroke recognition system to allow for actual writing practice of these characters" on the Facts Page.
So I'm a little excited,hoping that sometime in the near future I can practice those symbols on Skritter, because they are tough to memorize and master !!
link to the Facts Page : http://www.skritter.com/faq#kana_practice