Altas Van Lines just published the 2011 Migration Patterns for US and Canada.  It captures the number of interstate moves based on cross-border shipments of goods.  It does not reflect the actual number of households moving into and out of states as it omits such relocations as when a family packs belongings in a car and drives cross country, when a super-light traveler takes two suitcases and jumps on the plane, or when the illegal immigrants settle down.  However it does provide a real-time indicator of which states are growing in population and which ones are losing and can give us a glimpse on the potential rise and fall of housing demands.