This is where all the GEEK stuff is found.
Ohm's Law Calculators:
Calculate Volts, Amps, Ohms & Watts.
Find Brushless Motor KV & KT:
A tool for selecting Brushless Outrunners.
Motors & Props:
A tool for estimating prop thrust
Batteries in Series & Parallel:
How to wire batteries in series and parallel.
Comparing the different battery types.