Memrise is perfect
it helped me learning hirgana and katakana in just 1 week
I couldn't even believe i could read hirgana in 3 days.
but I used it day and night though,
I recommend it to anyone to learn and memorize a new handwriting or vocabulary.
and also I recommend anki freeware [url]ankisrs.net[/url] it's very good and it's like flashcards.