Free Ballistic software over at HuntingNut
I've only had time for a brief glace at this software, but I've learned enough so far to know where it needs some fixing and to know I would LOVE to have it as an Android App. (I don't take my laptop to the range normally)
More info AccurateShooter.com or more "accurately" at their wordpress; FREE Point Blank Ballistics Software
Leave us some comments on how this works out for you, things like this are VERY useful to long range guys.
In the mean time, I know an "Android" programmer... (hint hint, Steve)