The Heat Is On

Ah, USB: is there anything it can't do--or warm? First there were USB slippers to keep your feet warm. Then there were freakish-looking USB gloves to keep your hands warm while you type:
Now there is a USB coffee warmer:
I see a burgeoning market for USB hubs, though I wonder what the simultaneous use of all these USB heating devices would do to one's PC.

Then again, not living in the Arctic, I can't say that I have a great deal of use for these.