dave submitted a CNN article about a smart beer mat. It gets the bartender's attention (without showing any cleavage) when it detects when the glass is nearing empty by sensing the weight of the glass. It then sends a wireless signal to the bartender indicating a refill is needed. The device is plastic (to protect the electronics) so a cardboard coaster can be placed on top of it. There are also plans to integrate the device in bar games. "This could be used as a 'voting system' during karaoke competitions: patrons could raise their glass if they liked a singer, or flip it over if they did not, Butz said."