Walter's Famous German Language Essentials Guide

[Chris via Digitalmars-d]

As a not on the side, there are those who say that 
letter-to-sound systems should never be rule based, they should 
purely be based on machine learning. The proponents of this are 
usually native English speakers. For English you do need machine 
learning. For Spanish not so much. If you can feed the computer 
the rule "ch" = /tʃ/, why would you want to train it :)