IslandAl - we're wearing respirators, and thankful to have them, for sure! Even though the sanders have collectors, there's still quite a bit that escapes, and it gets airborne immediately. It's now all over every surface on the first floor.
We're definately going to do that wet wipe before applying the finish, because as we move around the rest of the house we don't want any dust settling into the wet finish!
Now a suggestion to anyone thinking about sanding their floors: If your finish is old, don't waste your time using the orbital sanders - head straight to Taylor Rental and get the belt sander and edger! We learned this the hard way, and after wasting a couple of hours and about $40 worth of sanding disks, we realized that we were getting nowhere. A few phone calls gave us the answers we needed, and the belt sander did a fabulous job!

I guess it takes a lot of might to remove 50 year old finish!