Re: iPhone or iPod touch ballistic programs
Ballistic AE. One stop shop as long as you have Internet it will get your local weather information and is stored with your zero. You create a trajectory by inputting all your specs, on the weather tab you click the upside down teardrop which auto fills your current alt, temp, bar press, and humidity. Save it as a favorite. Then you pull up the HUD, load your favorite and it corrects for whatever your current weather is in the same fashion and give you your current dopes.
I've found it to quite exact using the jbm and g7 ballistics. You have options for all kinds of things.. It's pretty amazing.
iPad and iPod/iPhone apps two separate purchases but your favorites can be saved to the cloud and shared between devices.
IMHO there's not much better out there.