I've just installed the n900 version and played around with it for few minutes.

Great Job! Looks really promising and I had no problem with dependencies or stability so far.

Few quick observations:

I had some problems with sound cards. When I create one, the sound is not played when the card is shown. Changing to in the edit mode helped and now it works, but it has to be changed for each card.

When I create a card the question can be either sound or text. Is it possible to have both in the same time (to see the word and hear the sound)? In the sound card the background of the question box is black with a sound icon and I cannot see the text I put in the edit mode.

Cards with images seem to work but if the image is too big it is not scaled, vertically it slides fine, horizontally sliding is blocked.