In the interest of full disclosure, I am the creator of an online system for tracking cub scouts, so my opinion should be considered with that in mind.
Cubtrails.com is the system I created for my wife and I when we worked in cub scouts (as wolf leader and Cubmaster). She helped me develop it over the course of three years to make certain that it was drop dead simple for non techies to use.
Of course it does all the standard things: achievement tracking, awards purchasing, parent login, email communication, etc... But it's also fully compatible with iPhone, android, iPad, and other
