There's a free service that helps all you writers out there proof your works ... it also helps anyone who just wants a break from reading to the kids, as well as those with assorted disabilities. Others convert text -- like their emails -- via this software to Mp3, and then listen while they commute or exercise.
It's the Natural Reader - and while there are voices much more natural that you pay a fee to use, there is a free option with a more robotic voice. For a listen, go here and to get the free Robot voice version, go get the free download.