Kanji
I have recently stopped using this application, because I have found some of the kanji to be incorrect.
On a good note, the author replies quickly to feedback.
I hope the kanji problems can be fixed soon as this program has a really nice interface and is easy to use. It was my number one Japanese study program.
The ability to add your own words to a separate list (as opposed to the original lists) would make a nice additional feature.
moomoochoo about
Japanese Flip