My iGoogle-applets
Here are two gadgets I wrote while teaching Japanese for practising the kanji (Chinese characters) and vocabulary from the popular textbook Genki; the kanji are for Volumes I and II, but the vocabulary still only covers Volume I – sorry. As long as iGoogle is still being supported, i.e. until November 2013, these gadgets are available to be installed on anyone's personal page; (at some point about 100 people were using these gadgets, which always got a 5-star rating – for user-friendliness and neatness, I hope.) Hint: If you bookmark this page while practising certain lessons, you can continue with the same lessons when you return on another occasion.
Choose lessons to practise (3 ≤ n ≤ 24):
from Lesson to Lesson  

Refresh the page for more kanji from those lessons.

Choose lessons to practise (1 ≤ n ≤ 12):
from Lesson to Lesson  

Refresh the page for more words from those lessons.