In Colorado basement walls have to be floating. Basically they are suspended from the floor joists, with a vertically movable anchor into the base plate, in case the slab moves due to expansive soil. More info/diagram is at http://www.asktooltalk.com/questions/faq/framing/floating_walls/floating_walls.php
I've got my walls up and anchored with 60d nails into the base plate. The problem is that when you walk across the floor above the new walls, there's enough flex in the joists to move the walls, and the 60d nails squeak against the floating bottom plate.
I tried drilling some of the bottom plate holes larger and putting a 5/16" T-nut in, in hopes that a smaller area of metal-on-metal would be quieter than 1.5" of metal-on-wood, but no such luck.
Any suggestions to quiet these down? It needs to provide a fairly snug fit to the 60d nails to minimize side-to-side and back-and-forth movement, but still be quiet. My next thought is finding a nylon spacer that fits around the nail and putting it in the hole, and possibly wrapping the nail with slippery tape (e.g. http://www.leevalley.com/us/Wood/page.aspx?p=32182&cat=1,43455,53293&ap=1). I don't want the tape to work it's way off in a year though...