I LOOOOOVE the liquid eyeliner in brown from The Body Shop!!!!! It's applicator has a very sharp narrow tip, allowing you to make a precise line. And it's long lasting!
I've tried using cream eyeliner in the form of a pencil and it works alright as long as the tip is sharp. But I get better results with the liquid version.
I saw this eyeliner tip on E!News: While applying your eyeliner, rest the elbow of the hand you are using on a flat surface, and that will give you cleaner and neater line, because your hand won't shake as much.