The site below is a do-it-all application for sending messages in different formats to different people with ease. If you email a certain person, text another, correspond via facebook with a 3rd person you can set up your address book so that 1 message can be send to all of them with one click, but they will receive it in the format you usually correspond with them. It's an up and coming site to look for in the next year or so.

http://twitr.me/