The next goal I've been working towards is clearing out the old bedroom so I can move my office into it out of the dining room. That will allow me to take out the cabinets and take down the wall into the addition.
I knew that we had a mold problem in the old bedroom, but I figured I could deal with that later. However, as I discovered previously, the existing walls are completely uninsulated and lack a proper vapor barrier. Couple that with inadequate heating (there used to be just a floor furnace in the middle of the house, which meant the extremeties got pretty cold), the fact the bedroom is on the north side of the house and shaded partly on the west side, and a large dresser against the wall that kept air from circulating, and well, yrch! The mold problem was worse than I thought -- much worse. More than a quick coat of Kilz would take care of, and more than I wanted to continue breathing.
So this week I've stripped the drywall off, run some new wiring for a nice, properly grounded 20 amp circuit for my computer equipment, and insulated the outside walls. And because there's diagonal bracing inset between the studs, the insulation and attached vapor barrier are more cut up than I'd like so I added a separate vapor barrier, too. Today I'm hanging new drywall and can hopefully have everything taped and mudded by next week. It all goes much more quickly with a simple rectangular wall and not so many windows.