iPhones and iPads are great devices to have when you are doing interviews. You could use these to go through your notes and interview notes. Thanks to the iXY microphone for iPhone/iPad, you can use your iDevice to capture high quality audio. It offers high quality recording at sampling rates up to 24-bit/96kHz.
The Rode iXY microphone has 2 half inch cardioid condenser capsules fixed in 90 degree alignment for stereo recordings. A foam windshield is provided for outdoor recordings. You can pick one of these up for $199.