Since we have acquired our new Minix boxes we have discovered that there seems to be a lack of in-built microphone and even the external 3.5 mm jack option doesn't seem to want to play.
However, we do have a nifty remote control unit (called an air mouse) that enables us to search Google by simply talking to it. Ergo, it must have a microphone and after a bit of playing around, we've found you can use it to Skype.
Utterly brilliant as Skype will pause what you're watching, pick up the cal and you simply chat away at your TV via the remote. No more missed calls.