Lifer - dhanna's right. Nothing we're putting is is 'commercial', marketing-speak just labels it 'commerical-style', or more commonly 'pro-style'. Much different than true pro equipment in that it's usually not quite as powerful (a burner on a Vulcan is 30k BTU, compared to 18k on the Wolf we're looking at), and they're extremely well insulated. A commercial appliance will burn you if you pretty much look at any of the surfaces wrong. You can touch the front apron or door on a Viking and it will be cool to the touch. So far as I know, Wolf, Jade, Viking et. al. are all approved for residential use. You can nestle them right between two cherry or MDF cabinets with no risk of scortching.
Tinknocker - very good idea. Unfortunately, the kitchen is 100% land-locked - no outside walls. Do you think this would work with another duct (or ducts?) up through the roof?