Since it's O-3, O-2 and E-5 EVAL/FITREP time, might as well start reading the instruction again:
http://www.public.navy.mil/bupers-npc/reference/instructions/BUPERSInstructions/Documents/1610.10C.pdf
For the officer FITREPs, it's a good idea to read the O-4 convening order to get an idea of what sorts of things you should put in your FITREP:
http://www.public.navy.mil/bupers-npc/boards/activedutyofficer/04line/Documents/FY13/FY-13%20AO4L%20CONVENING%20ORDER.pdf
For the E-5s, I recommend reading the Chief's board precepts:
http://www.public.navy.mil/bupers-npc/boards/activedutyenlisted/Documents/FY13%20E7%20BOARD/FY13%20SEN%20ENL%20PRECEPT.PDF
