Online Foreign language courses

Here's a great example of the learning capabilities offered by the web. The FSI Language Courses is a site that offers language courses, originally developed for the United States government and are "...now in the public domain."
Each lesson contains a downloadable mp3 audio file as well as a .pdf lesson. They currently offer courses in:

• Chinese
• Cantonese
• French
• German
• Greek
• Portuguese
• Serbo-Croatian
• Spanish
• Turkish

Hat tip: Lifehacker