inevu via the Adafruit customer support forums writes -

Hey Guys! Today I will be talking about the best Power Adapter for the Raspberry Pi.

Here is the link to the Power Adapter I bought (Adafruit).
Here is the link to the A to micro-B USB cable I bought.
Rubber Feet.

This video shows how awesome our (now updated!) 5.25V USB adapter is – we designed it specifically for use with products like the Pi that want 5V but have high enough current draw that they pull too ‘hard’ on usual iDevice chargers and droop the voltage. Perfect for your Raspberry Pi!