The American Institute of Architects released it's September Architectural Billings Index (ABI). It's at 54.3, up from 53.8 in August (a value >50 indicates and increase in billings). The ABI is considered a leading indicator for construction activities.
The above figure is courtesy of Bill McBride at the Calculated Risk Blog.
Some other details:
Over the last year, multi-family led the pack. It will be interesting to watch if commercial/industrial stays out front.