TomTom on the iPhone uses Vocalizer voices (in many languages). I modified these voices to make them work on a PND. This way, besides US English, Spanish and French speaking people, also Dutch, German and Italian speaking people are able to use TTS on their 32MB RAM devices. (The US English, Spanish and French Vocalizer voices are already available for a long time.)
UPDATE 4/11/2013: I have removed all files as they were taken offline ...