Brian: There are 3 things that are indispensable to my game: iPad which has everything in PDF for reference, tri-fold GM screen and my “noteboard”. www.noteboard.com. I’ve never tried any RM software—I guess I’m too old to learn new tricks.
Peter: I agree with the Tablet PC. I don’t have a GM’s screen but I have created a small PDF with just the few charts that I need for running a game that serves the same purpose. I tend to print the important specific rules that relate to bits of the adventures and insert them into my plot notes at that actual point so I don’t have to access any rulebooks during play.