I wrote a decent little die roller back when I was first learning to program the PocketPC. If you'd like a copy, feel free to email me. It allows you to roll whatever combinations you want, stores favorite sets, and provides a running history of rolls. It's pretty basic, but fairly fun. I took digital photos of some dice for the interface (just tap on the litle picure of the color-coded die you want if you only want to roll one). I've become much better at PPC interfaces since then and don't have the time to rewrite this guy, but it's still pretty sweet.
mailto:fastlearner99@yahoo.com