I just saw an awesome show on the History Channel, called Mega-Movers. This particular episode was about the firm Expert House Movers, run by the Matyiko family. In the space of an hour episode, they showed the firm move three older houses on the Grand Banks in the Carolinas, and a 900-ton Colonial Revival brick building somewhere in New England (I think).
Talk about a job with a lot of details to watch! The brick building was especially tricky, since when they put it on the new foundation, they had only about 1 or 2 inches of margin.
They used a LOT of iron beams, and the hydraulic jacks they used were also pretty impressive. I was surprised at how small an engine they needed for the hydraulics, I think it was only a couple hundred horsepower, maybe less?