There's a van parked across the street from my apartment labeled Digital Concrete. That sounded about as useful as Online Haircuts. But when I visited the Digital Concrete website, it was pretty interesting. They have a bunch of scanning equipment they use to look "through" concrete if someone's thinking of drilling/sawing a hole in it. They specialize in finding ways to cut through Post-Tensioned Concrete. Until I read their website, I didn't know what post-tensioned concrete was. Neat stuff: Digital Concrete