Cool! I'll have to get one.Glad you asked. It's this — the Zojirushi Stainless Steel travel mug.
If you drink hot liquids like coffee or tea, and like to travel around with them, this is THE best mug you can buy. It's amazing — I often make a single batch of coffee in the morning and drink one with breakfast and put the rest into the Zojirushi, and it's still hot by mid-afternoon.
Highly recommended!