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Staying anonymous
spyware wrote: http://www.screamingbee.com/store/skype.aspx
good link.
I'd think whatever algorithm is used to distort could be reversed, which would bring it back to your original voice. I'd use something like this
http://www.naturalreaders.com/
I haven't tried it out, so if something goes wrong google: text-to-speech. It looks like a very handy piece of software though.