This guy has made the neighborhood’s power go off and his electric bill is $2000/month. Truly spectacular! It’s on the Jamaicaway if you want to see it.
Update: This display is up again in 2007, this year with a crown on top of the house. The address is 61 Arborway, Jamaica Plain, MA (map link here, but really you can’t miss it!). A quick little video showing the 2006 display is here.