Note: With OS X Lion (10.7) 'Text Reader' is able to read text in over 20 different languages: Arabic, English, Czech, Danish, Dutch, Finnish, French, German, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish, Cantonese, Mandarin, Greek, Hindi, Indonesian, Romanian, Slovak, and Thai. Voices with different dialects are available as well. Please note, that not all languages are installed by default because of the size. You can download all voices for free like you can see on the last screenshot.
Text Reader is a simple to use speech synthesizer which will read any text you want for you and gives you the option to save it as an audio file so you can send it to someone else or listen to it by yourself when you are on your way. You can choose from more than 20 different voices which you can download for free like you can see on the last screenshot. Aditionally you can vary the the reading speed from slow to fast.