Slashdot linked up this Detroit News article that details how the auto industry is adapting nanotechnologies to build better cars. Turns out GM is already using nanotech in a limited way for pedestrian things like bed liners, but this is only the beginning. Windshields that don't crack, paints that won't scratch, suspensions that adapt themselves to the road, all and more are within reach.
I still think that my great-grandchildren will build their dream homes by picking a pattern out of a book, buying a 55-gallon drum of liquid, a 10-pound sack of "dust", and a dumpster full of specially-formulated dirt. Dump the sack in the drum, stir for ten minutes, then dump the drum on the dirt. A week later, and there's your house, ready to move in. All that's left is to clean up the dust, mummified corpses of a million machines.