This is a very nice dice simulator (though it appears to simulate rolling dice in a low-gravity environment....)
Version 2 adds a few game-specific dice, such as fudge dice or the averaging die, but of course the basic "D&D set" is all there as well. I like the ability to set colors, but Im not a fan of the round tab that sticks out all the time-- I much preferred version 1s way of pulling the dice drawer out from the edge.
As others have mentioned, it would be nice if you could change backgrounds and name dice sets so its easier to know at a glance what bunch of dice youre looking at.
Overall though, this has the best feel of the dice rollers Ive looked at. Very nice job!
UPDATE: I would just lurve to see this app updated for Retina and the iPhone 5 screen. Still a great app!
Stee-rider about Pip - RPG Dice, v2.0