Vessyl

Vessyl is a "smart" drinking cup which can detect what sort of liquid is placed in it (even down to brand names), and keep a log of what you drink and the calorie counts associated with it. If you want to spend $99 (reduced from $199!) for a cup that's not the Holy Grail, this is the one to get!

Despite the silly-spelled name, apparently vessyl.com was already taken and they had to settle for myvessyl.com.

Links

 * Official site
 * Stephen Colbert makes fun of it