I've been working on this too, but only with an iPhone client to start (though still with the data "in the cloud"), and only targeting Japanese to begin with. Anki runs into trouble when you need to customize it to suit your material - and then when you download any shared decks, each one uses its own scheme of representation. It's great software but not very friendly.

There's no excuse for you to use Leitner though. Anki is based on the SM-2 algorithm which is well-documented (though only a starting point).