The site calls them “Lover’s Cups”, but I think they are just a way for lazy people to get drunk with each other (like if I’m too lazy to go to a buddies house)…

Lover’s Cups explore the idea of sharing feelings of drinking between two people in different places by using cups as communication interfaces of drinking. Two cups are wireless connected to each other with sip sensors and LED illumination. The Lover’s cups will glow when your lover is drinking. When both of you are drinking at the same time, both of the Lover’s Cups glow and celebrate this virtual kiss.

http://web.media.mit.edu/~jackylee/cups.htm