Many writers stage live reads or ask friends to read their dialogue aloud - but now you can achieve the same affect without leaving your chair or speaking to humans. Check out ReadThrough.com, which lets you upload your script to a website and instantly hear what it sounds like. The site, which features 100+ voices, lets you listen on-line or download an MP3. PDF, Final Draft 8, Celtx, Word, Text and other files are supported. View a demo or jump right into a one-month free trial.
I haven't tried it - so let me know what you think if you give a try.