Bees?
Use the Apiary and breed a valuable bee with a leoprine bee (you've got your chance for a limited time only!)
Use a wither star to get the mutation chance to 100%, cause it's .01%, and you've got your skype bee! Centrifuge the combs (if you can get any before they die), and put them in a carpenter with a few noteblocks.
That's not even funny though, so I'll stop.
But Thaumcraft? We call it the arcane ear. 64 different notes can be accepted, and just let it output the notes into letters.
I'm going to have to do that, skype calling. Maybe with some CC to put the letters on a monitor. Yes, you could use rednet, but why use rednet when you can use notes?!