Re: Ballistic Software
Google Search (see my signature) is your <span style="text-decoration: underline">friend</span>. There's been <span style="text-decoration: underline">lots</span> of discussions on various ballistic calculators, their pros and cons, etc. Do a search - you'd be amazed.
Coincidentally, many (including myself) are happy with Bullet Flight and Ballistic FTE (in that order) on iPhone/iTouch, Shooter on 'Droid, QuickLoad/QuickTarget and Patagonia LB3 (you may have problems getting to technical people there - I couldn't) on PC, FFS (Field Firing Solution) as a standalone PDA/GPS.
Then if you like tinkering with software - there's free (under GPL license) GEBC that you can make working. I was going to polish it myself, but didn't find enough time - and Bullet Flight does the job for me so why bother.