From PC Magazine
The app, which was released in June, now includes features like searching within the text - by typing or voice. Users can also make annotations and highlight text. There is also a connection to Shelfari, the book-focused social network, which includes things like description of the book, synopsis, summary, and cast of characters.
Kindle 3 currently has a non-functioning microphone. I wonder if a future firmware update will enable it and allow voice search on the Kindle as well.
Is there someone with the Android app who could tell us how this works?