IK Multimedia iRig Mic Cast
What it is: The IK Multimedia iRig Mic Cast is an external microphone for your smartphone or tablet.
Why it's awesome: If you produce podcasts or use your smartphone for recording music, you'll find that this high-quality microphone runs circles around your built-in ones. The iRig Mic Cast allows real-time monitoring and even has a low/high sensitivity switch.
Where to buy: Amazon