I've been working at this, but have a few details to attack: cobwebs in corners, taking down curtains and washing them, pulling the bed and nightstands out and vacuuming behind/underneath, washing windows/sills/tracks, wiping down light switches, taking down and washing light fixture covers, shampooing the section of carpet that gets a lot of traffic, cleaning out heat registers and air return grates, replacing furnace filters.
That's all I can think of for now. I'm sure there's more I can add later.