Someday you may be able to:
Got a non-barcoded product you can't identify? 3D scan it and automatically identify the make/model and shop for it.
Get sized for clothing without stepping into a store, and then get tailored clothes straight from a factory via an Internet order.
View 3D models of everything as you shop online.
That's just a few retail-centric ideas. I imagine there's also applications possible in the arts, gaming, etc.