http://forum.worldoftanks.eu/index.php?/topic/486640-hellfishs-fc-academy/ Hellfish's FC guide. Great surface guide and methods.
http://forum.wotlabs.net/index.php?/topic/15443-field-commanding-guide-for-new-commanders-by-waterwar/ WaterWar's FC guide
https://drive.google.com/file/d/0B5Ry9WNTK98qbnJCSHV0aVozbEE/view?pli=1 this IS a PDF so it will set off all kinds of alarms but its clean. awesome read on military theory and how it applies to the game. Great read for those who want to be a better indepth caller.
I'll add more as I come across them. (good ones. not meh)