Just a quick note that I’ve finally gotten through the App Store approval process, and the ~4 hour wait to have the app show up in the store…
DiceBook is a specialized PDF reader that includes a flexible dice roller. It’s designed to be used with rolepaying games (like Dungeons & Dragons, HeroQuest, or Spirit of the Century). You can make dice rolls without leaving the app (so it should be useful even when iPad gets fast app switching).
Learn more from the DiceBook web site, or go right to the App Store.