If you read Eric's Credits.txt file you will see that it says
- All voice samples were made with AT&T Natural Voices
http://www.naturalvoices.att.com/
I'm not really sure you can use these commercially or anything...
Though the AT&T one is quite good, I think the range of voices you get from ScanSoft @ http://www.scansoft.com/speechworks/...mo/default.asp is better. Though it is unclear whether you can use them in your games without fear of litigation.

Btw, would all the entrants please let me know which images they would liked used in the Flipcode.com Image of the Day submission.