For our group web page and for the mini-navigator that one of our fellow cruises gives out we take the deck plans from here on the DIS and then color the all the DISers rooms lime green.
The girl who does the navigator then also has a list of all the cruises and puts a Nemo next to those who signed up for the FE and a Crush for those who were a little slow and signed up after the cut-off date. It has worked great for the last couple of cruises.