Expresskurs Japanische Schriftzeichen
This german book is intended for better remembering the kanji. Therefore the historical development is explained. This may be interesting but actually is not the best way to keep the kanji in mind, as the development is most of the time too far away from the actual kanji. Plus I missed a lot of kanjis which I found in the Kanji Pict-O-Graphix. Still, you find words which consist of more than one kanji (Though you won’t ever need that when you use padict and Kanjipict-o-graphix).