Apple Users

control-a go to the beginning of the line
control-e go to the end of the line
control-n go down a line (next)
control-p up up a line (prev)
control-f go forward a character
control-b go backward a character
control-d sucks up the next character
control-k kill (delete into kill buffer) from the current position to the end of the line
control-y undelete (yank) the kill buffer into the current cursor position.
control-l scroll window to center the current line