From Shark Labs:
Clownfish is an online translator for all your outgoing messages in Skype. you can write in your native language and the recipient will receive the message translated to their language. There are different translation services you could choose from. It features built-in spell check support, text-to-speech support for all incoming messages, ability to send of predefined ASCII and emoticon drawings, Virtual Studio Technology (VST) Effect plugin, secret data will be secured, and show an avatar image on every message you receive.