Fun With TTS lets you hear what you type.
Select one from the eight voice models and adjust the speed, pitch and variance settings.
You can save your favorite texts for later viewing, playing, and sharing.
Sharing can be done via email (with text and audio attachments) or via Twitter (text only, for now).
And there's more:
The Name Game: enter any name and play the Name Game as popularized by Shirley Ellis, Laura Branigan, and many others.
Biblical Curses: generate curses like what the Biblical prophets uttered from their wrath, and you can share them to your friends too.