AV3 Software has dropped the price of GET, the phonetic search plug-in for Final Cut Pro to $249. GET [they don't capitalize it, but it's confusing if you don't-Ed] will quickly index the audio tracks of footage, and then you can search for words phonetically.
For documentary workers, I think this tool would be indispensable. You can download a trial version from their website: www.getphonetic.com.
NotesOnVideo: 'get' for Final Cut