Google announced the AxsJAX extension for Google Moderator that enables fluent eyes-free use of the tool. With the AxsJAX extension in place, you can use Google Moderator via the keyboard, with all user interaction producing spoken feedback via W3C ARIA.
For details on installing and using AxsJAX extensions, see the FAQ. Briefly, you need Firefox 3.0 and a screenreader that supports W3C ARIA. Users who do not have a screenreader installed can most easily experience the results by installing Fire Vox, a freely available self-voicing extension for Firefox.
More info: Google Blog