Having developed tendinosis (5 years ago while doing data entry for an insurance company) after having already been trained in computer programming, I spent time (far too much due to my tendinosis) developing a free web service that allows folks (particularly those with hand/arm disabilities) to send voicemails through email. I essentially developed it for my own needs, but made it available to everyone.
This service can be used to send a voice message to someone's email address, when you might not wish to call their cell phone. Let's say you don't wish to have a live conversation with them, or they're sleeping and you don't wish to wake them. You can also serenade someone in a way that's just not the same through email. Also, I was tired of folks misinterpreting what I typed because it didn't convey the inflection with which I meant it. Now, I'm more easily understood.
AcousticMail is in beta, which in computer speak means there might still be some bugs here and there. Let me know if you find any.