Interfacing with RC Speed Controllers

This may be a lame question but, Speed controllers on big RC cars can they be controlled from Arduino? If yes, do they have a standart? do I control them using PWM values? What should i look for if I am going to buy one?

Control them like you would a servo, with the servo library.

What should i look for if I am going to buy one?

A current rating sufficient for the motors you intend to use them with.