Another one from Lifehacker.
The Foreign Service Institute developed the FSI Language Courses site which is dedicated to make language courses freely available in an electronic format.
These courses were developed by the United States government and are in the public domain.
They are provided in MP3 audio and text PDFs.
The current curses are: Cantonese (Basic), Chinese (Standard), French (Basic), German (Basic), Greek (Basic), Portuguese, Spanish (Basic and Programmatic), Swedish (Basic), Turkish (Basic), Vietnamese (Basic)
For more goodness about langagues in Lifehacker.