Getting Better Voices
TextAloud by default comes with older Text To Speech engines from Microsoft. There are other, newer engines available for download at http://www.nextup.com/TextAloud/SpeechEngine/voices.html
In the last couple of years, a few companies have developed really great sounding voices that are much closer to listening to real human speech. These voices are not available for free download, but must be purchased. Visit the web pages below to hear samples of these exciting new voices.
AT&T Natural Voices
http://www.nextup.com/attnv.html
Cepstral Voices
http://www.nextup.com/Cepstral.html
NeoSpeech Voices