MapTool has a built in dice interpreter, so you can type things like [d20] into the chat panel and it will kindly obey. Phoenix RPG uses exploding dice for most rolls, and MapTool supports this with the 'e' suffix: [d20e].
However, it doesn't show component dice involved in that roll, so if you roll [2d6e], and get a 9, it is impossible to tell whether that roll was 5/4, or 6/1/2. (School me if you know a way around this.) Also, it's pure text, and I prefer seeing the dice imagery.
I'm not trying to take away from the very awesome job the devs have done on this product, but for my game I would like to see all the individual dice - graphically - and have the explosions displayed in all their extra-dice glory. The excitement of getting a die explosion is very important to the Phoenix experience, and I want virtual play to get as close as possible to the same fun!
No problem - MapTool has a macro language, so it's a good time to try it out.