Turn Firefox into a screen reader with Fire Vox, suggests Roger Johansson of 456 Berea St. He talks about his experience with Fire Vox, the free open-source screen reader extension for Firefox. He has successfully used it on his Mac (after a few unsuccessful attempts), but Fire Vox can also run on Windows and Linux.
The free price tag removes any excuse a developer or writer might have for not testing their web-based material with a screen reader.
Have you tried this screen reader extension? What other screen readers do you know and love (or loath)? Share your experiences in the comments.