well, a DSA (or DND or Shadowrun) assistant on the iliad would be great.
I already plan to scan my source books and put them on the iliad. It's significantly lighter
I think every Dungeon Master in this world would love a tool which handles the NPC in combat. (So you can give your players these raid-a-camp-adventures you don't want to play because it involves throwing dice for 20 enemies)
Then add a map on which you can move stones with the stylus to visualize tactical situations and you got nearly everything for a basic rpg on the iliad.
Actually nearly every board game you play without computer might be quite easily adapted.