My wife has a Kindle that she uses all the time. She racks up a hundred bucks or more in charges for new books each month and when she gets tired of reading, she uses the robotic voice on the Kindle to read the books to her. I have heard that voice before and it sucks.
Amazon has now announced that the Kindle can now stream Audible audio books (with human, not robot voices) over WiFi. You can also connect the Kindle to your computer and download the audio books to the eReader for listening on the go away from WiFi. It appears that the books will not stream over the free 3G connectivity that the 3G models have at this point.
It’s also not clear from the official post if this requires a firmware update to the Kindle. I would assume that it does since this is a new feature. You can sign up for a free Audible account for 30 days to try the service out.