The following texts are currently being hosted at http://www.eric.ed.gov/.
Communicating in Polish
Czech Basic Course
Dari Basic Course: Books 1-6
Dari Newspaper Reader. Vol. 1
Indonesian Newspaper Reader
Kirundi, Basic Course
Persian Basic Course: Units 1-12
Spoken Dari. Preliminary Edition
Adapting and Writing Language Lessons.
For other FSI/DLI texts as well as a host of other material, check out http://soyouwanttolearnalanguage.googlepages.com