you cant download some of them unless you pay, but is you download a recorder like audacity, and set the capture to widows output, you should be able to.

http://www.voiceforge.com/demo/

http://www2.research.att.com/~ttsweb/tts/demo.php

http://cepstral.com/demos/

http://vozme.com/index.php?lang=en

http://www.ivona.com/

http://say.expressivo.com/

http://www.spokentext.net/

you will have to spell some things wrong like: weev got americaan tanks aproaching, get the ar pe g's

some do sound like robots, but some are really good.