Of the three environmentalist R's, I've always seen Reuse as a quiet little brother to the slightly over-glorified Recycle and the get-tough Reduce. Lately, though, it seems like the littlest R is getting all growed up. Reusing building and remodeling materials has become a sizable business, with tax incentives prodding constructors and deconsturctors alike with reason to repurpose those old solid-core doors and clay roofing tiles rather than chuck them landfill-ward. And it's not just earth-shippers and hippies on the reusable tip. The Singing Saw is a lumberyard outside of Boulder that sells wood reclaimed from farmhouses and barns back East for many pretty pennies. They're finishing the interior of a 2,500-square-foot great room with reclaimed fir from a torn-down dairy barn - yes, just the great room, so imagine how big the house must be - just to get the "look" of an old ranch. Ostentatious? Totally. But at least, in this case, far less damaging to the environment than could have been.