Long-time Gizmodo readers know that we have a soft spot for all those unusual (and often pointless) USB-powered gadgets that keep popping up, like that USB toothbrush and the USB “personal massager”. Over at Cruftbox.com, Michael decided to satisfy his curiousity and actually shelled out the cash for a USB Coffee Cup Warmer. Much to our disappointment, he discovered that it could barely get lukewarm, let alone generate enough heat to keep a cup of coffee properly warmed.
