Text+to+Speech

Free Text to Speech http://udltechtoolkit.wikispaces.com/Free+text+to+speech

Apple VoiceOver http://www.apple.com/accessibility/voiceover/

media type="custom" key="4989051"

VoiceOver in Leopard http://www.woopid.com/view_video.php?viewkey=81111001

VoiceOver for Sighted Users http://atmac.org/voiceover-for-sighted-users/