I'm agree, quality leads comes from facebook. Still I have few points to discuss, if implemented, then can be effective.
>>> Make Your Facebook Fan Page Unique !!
# Design a different and unique facebook graphics.
# Try to update status which the fans do not get somewhere else.
# Post unique and use different variety of images and tag the friend on them.
# When someone visits the page first time, make sure that he would visit next few times too.
# Interact with your facebook fans, do reply of their queries
# Find ways to invite and reward interaction from fans.