Tweetspeak

Listen to any tweet in its original language on Twitter web interface

Drag Tweetspeak to your bookmarks bar
Go to Twitter.com and click your Tweetspeak bookmark
Done. Click the Speak link next to any tweet to listen ;)

Supported languages: Catalan, Chinese (Traditional and Simplified), Danish, Dutch, English, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish

Tested on Chrome 12, Firefox 5, IE9, Opera 11 and Safari 5.