Sadly Nissan didn't give some nice threaded holes in the rotor hat to push them off of the hub in a civilized way, like it said on the front. If it's anything like the rear rotors on the wife's G they're a real pain. Try spraying a penetrating oil in around the area where the studs fit through the rotor and let them sit for a while - preferably overnight. Clean everything up with brake parts cleaner when they're off. Rotate each one so that while you're spraying the oil in it's facing down so that gravity can help it seep in around the stud onto the face of the hub where it's rusted to the inside of the rotor hat.
On the wife's G I used a big hammer and a long scrap of 2x3 and beat the crap of of it placing the wood on the hat. Eventually I pryed the rotor off by placing the handle of a big adjustable wrench that has a rubberized coating between the back of the rotor and the "ears" that hold the caliper on.
They aren't bolted on or attached in any way - so pound away...
You can download the 2005 FSM here at
http://www.nicoclub.com/FSM/ for other information and torque specs. It only says "remove brake rotor" in the manual, but it helps. I coated the hub with a light coating of antiseize compound, so we'll see if that helps next time.
Good luck!
Heath