Ask HN: Resources for learning Ada?

I've got an interest in obscure programming languages; recently Ada caught my eye due to its origins in the U.S. D.o.D. Does anyone know of any good resources for learning Ada?

http://learnadanow.com is done by the same guy that does GetAdaNow.com

The Ada Information Clearinghouse has a section for learning Ada: http://www.adaic.org/learn/

There's a toy LISP I did as/for a tutorial, though this is the final product: https://github.com/OneWingedShark/Ada_Tutorial

And here's the home of the ARG, Ada's design group: http://ada-auth.org/