killer app

I find myself always wanting to check e-mail while I am driving... obviously not safe. (given the fact I have three kids, I am very good about resisting the temptation) I think it would be cool to have a text to speak app that would read my e-mails to me while I am driving. I realize that this is not really that revolutionary, as I know there are applications that will do this on a desktop. I am not sure if smartphones have the horsepower to to run something with good enough sound. it would definately be a nice addition to windows mobile...