ka1axy: Assuming they're using something with a built-in NIC (like an ARM processor -- Freescale Kinetis for example) as a system (vending machine) controller, they wouldn't get a MAC address with the device, but would need one if they intended to use the E'net interface.
Although, that wouldn't match the diagram shown in your posting -- these devices would be all over the place, not bunched on a single private network.
08-00-1B -- still have it memorized after 25 years...I developed some of Data General's first LAN cards.
My next guess is an shipment tracking on scale that only Walmart has tried. They'll use WiFi chips instead RFID because of range and a little more security. A reason they may stay away from something like XBee maybe cost and a less common standard. That my two cents.
You are correct. Version 1 and the original Version 2 had it. But YouTube changed it's ad model. Roku and YouTube/Google couldn't agree on how the ad revenue would be shared.
If I remember correctly the reason that ad revenue issue even came up was because YouTube has switch to MP4 streaming and the Roku players couldn't handle it at the time. So Roku setup a conversion proxy and to pay for it Roku wanted a percentage of each ad.
Its been done before for less
Aurdio Laser Modem:
So the fuel cell is creating a emissions of sort. It looks like they're using hydrogen and natural gas. Hydrogen will raise moisture levels and possible damage to the equipment. There is research to suggest that that burning hydrogen may have negative environmental impacts. Natural gas still has a carbon footprint and the switch to using it in wide scale production will cause a rise in price for all consumers.
The more we try find solutions to old problems the more we create new ones. If we switch to fuel cells we'll see a new green movement to fix those new issues.