Mine was creaking it became so tight. After reading another thread, I picked up a micro screwdriver set at Home Depot and used the #00 philips, loosened (NOT removed) the 4 screws (at the hinge area of my PBook) and dropped a drop of electric shaver oil in the gaps, moved the lid back and forth a dozen or so times, tightened the screws and it's great now.
I realize this is loosening and not tightening, but I can assume the #00 tightening up your screws, if they're loose, can help.