Here’s an interesting interface experiment by TOKI WOKI: an alternative character picker for the browser. Mobile operating systems like Android and iOS have a way to insert alternative characters, for example, by holding the letter ‘e’ on the virtual keyboard, you’ll be presented with the choices of using ‘è’, ‘é’, ‘ê’, ‘ē’, among other variations, giving you quick access to an expanded Latin alphabet.
Here’s a screenshot of the interface in action:
OS X Mountain Lion already has this feature, brought back to the desktop from iOS, but this might still be useful for sites targeting multiple environments. There is a GitHub repository with the code.