The Kanji SITE was launched in September 1999 as a way for its author, Chris Jennings, to practice his kanji in preparation for the Japanese Language Proficiency Test (JLPT). It originally covered only the 80 kanji required for Level 4 of the JLPT, but has since grown to include a total of 1,000 kanji, namely the entire official syllabus for Levels 4, 3 and 2 of the exam.
The Kanji SITE is aimed primarily at people who are studying for the JLPT, and as such the kanji are organized according to the syllabi for Levels 4, 3 and 2 of that test. The JLPT Level 1 kanji will start to be added in due course. It will soon also be possible to study the kanji in the order that nature (well, the Japanese Ministry of Education, anyway) intended, i.e. according to the government’s official Joyo and Kyoiku Kanji lists.
Editor’s Note: I love this site!