NAHB Housing Market Index

I was reading a Market Watch article on home builder confidence falling again in Sept. It mentions a housing market index produced by NAHB and Wells Fargo and how this index "has had a fairly good record of predicting the number of new homes started." NAHB has a web page for economic and housing data and it appears to give an excellent overview (they say "pulse") on how the housing and real estate market is doing overall and within each state.