text-to speech software

[cet]

I am looking for a text to speech software.I surf a lot,my eyes get tired.Are there any free good programs.Some programs offer only robotic voices,it is hard to listen to them.I am looking for a text reader program( free is better) with natural voices.

It can also be an add-on for firefox.

[rice4lunch]

TextAloud MP3. get the mike and crystal voice, they're the best.
http://www.nextuptech.com/
they're not free though...

[demonon]

Also Opera browser with a small download of 10 mb gives you the ability the read text aloud.