Last Sunday, when all of Canada was celebrating a win in the gold medal hockey game, I was celebrating the end of this stairs project (of course I was celebrating the hockey win as well).
Our stairs were quite noisy, so we tried to reduce this noise by screwing the risers to the treads and screwing corner brackets to tighten the treads to the risers; this didn't seem to make much of a difference. I then applied construction adhesive to all of the seams (i.e. tread/riser, tread/stringer, riser/stringer); this reduced the noise on the stairs by about 80-90%, so I was happy with that result.
Once that was dry, three coats of oil-based polyurethane were applied. I will take some photos of the "finished product" in the daylight and post them this weekend. We still need to install hardwood flooring on the landings, install the baseboards, paint the stringers/spindles/baseboards white, re-paint the wall, and have a runner installed. The hard work is done though.