I stole this link from John's Crawlspace (pretty good site, btw), it's a text to speech converter that works online. You just type the text you want to hear, click the button, and it downloads a sound file (wav, au, or aiff) of what you typed. Ok, so it's not quite as efficient as the multitude of text to speech programs that actually run on your computer, but it's still a Neat-O^® idea. :)

Oh yeah, check out Asrnet. It's a pretty decent site.