Here is a lesson on Picking technique from David Bond one of our resident online guitar tutors. As the name implies the technique is executed by strict alternate picking (up stroke of the pick followed by down stroke of the pick). The accompanying video will explain in greater detail.
This technique will allow you to play fast sequences, scales etc in the style of Paul Gilbert, Shawn Lane, Yngwie Malmsteen. This technique will require careful and patient practice with a metronome to get down, however once mastered the technique can yield truly breathtaking lines and licks.