Blackfoot: Blackfoot linguistics information and Blackfoot-language texts.
Blackfoot: Bibliography of Blackfoot language learning materials, with order information.
Blackfoot Audio Samples: Audio samples of the spoken Blackfoot language, with a brief biography of the speaker.
Blackfoot Language: Wikipedia article.
Blackfoot Maintenance: NPR audio report on Blackfoot language maintenance efforts.
Kids' Stop Languages: Siksika: Audio phrasebook in Siksika Blackfoot, aimed at children.
Native Languages of the Americas: Blackfoot (Siksika, Peigan, Piegan, Kainai, Blackfeet): Annotated collection of links.
The Blackfoot Language: Information on the dialects, writing systems, and sociolinguistics of Blackfoot, from linguist Don Frantz.
The Linguistic History of Blackfoot: Discussion of the historical relationship between Blackfoot and other Algonquian languages, and a look at the evolution of Blackfoot grammar.