[GolfSavage]

My best friend uses a line. He has on of those plastic things with a slot that you clip over a ball and then draw a line. He bought me one for Christmas, and I tried it, but found it more of a pain to squat down and try to line the ball up on my mark. I prefer to just set my putter behind the ball, and align the putter towards my mark while looking down. My putter has three lines, the outer lines set at the width of a ball, and a longer center line for aligning the putt. Works quite well for me.