Straightforward article by Charles Moeller provides an overview of the order's history.
Timeline by Eric Opsahl at the Online Reference Book for Medieval Studies covers events related to the Teutonic Order from 1070 to 1500.
Available in German, Czech and English, this site by Wolfgang Krones includes a brief history of the Teutonic Knights as well as information about the order today and its structure. Also includes a short glossary.
Thorough article by Eric Opsahl at the Online Reference Book for Medieval Studies covers the order's origin and history, its internal structure, and its guiding philosophies.
François Velde's brief history at his Heraldica site is accompanied by information on the heraldry of the order and some nice images.
Extensive, well-referenced, hyper-footnoted article article by Guy Stair Sainty at the Chivalric Orders site covers the history of the Teutonic Knights from the origins of the order to the 20th century.
Albert rejected the order of Teutonic Knights and converted to Protestantism. An article from the 1911 Encyclopedia.