The Mozart Project
Offers a biography, compositions, selected essays, bibliography, and links.
www.mozartproject.org/   reviews

Classical Music Pages - Wolfgang Amadeus Mozart (1756-1791)
Includes a bibliography, photos, music info, and more.
w3.rz-berlin.mpg.de/cmp/mozart.html   reviews

Wolfgang Amade Mozart
Includes concerts, compositions, biography, and media library.
www.w-a-mozart.com/   reviews

Mozart Studies Online
Hideo Noguchi's studies into the autograph scores, the printed editions, comparison with the contemporary composers and many scholars' studies, etc.
www.asahi-net.or.jp/~rb5h-ngc/index.htm   reviews