Handloader Calculations

I have a new app out on Android App Market, an internal ballistics calculator and a reloading "Money Saved per Hour" calculator for rifle, pistol and shotgun. There is also a Bullet Stability calculator using the Miller equations, and a Standard Deviation Chart plotter.
In theory it is platform independent (it is essentially an iPhone app) so it should work on the Blackberry, Symbian-Nokia, and Windows phones too.
The internal ballistics calculator is just the old Powley slide rule, you can't use it to roll your own super hot wildcat cartridges, but you see what seating a bullet deeper is likely to do, that kind of thing.
The reloading savings part is a "What's your time worth" calculator, if you reload a lot you may find that spending twice as much on equipment will save you money if it makes you 20% more productive.
There is a Miller Stability calculator for rifle twist.
You can type in a list of numbers, and calculate standard deviation, to compare the consistency of things, from muzzle velocities to component variability, to group size.
Generally, the Blackberry and Nokia programs are looking primitive to the Angry Birds generation, so I am doing things the easy way with a simpler app development system.