Only two so far: MacBook and Chromebook Pixel
Asus should have product coming along shortly, likely in their ZenBook line, but it's not available yet. Dell should have something soon too.
My latest desktop PC build has USB 3.1 (Type-C connector)
Originally Posted By: spk2000
What advantage does 3.1 have over 3.0?
3.1 is theoretically twice as fast as 3.0. USB 3.1 is also the first real widespread integration of the Type-C connector (though Type-C is not directly tied to 3.1). USB 3.1, along with Type-C, gives the ability to integrate the new USB Power Delivery spec, which will provide power transfer of up to 100W, while still transmitting data. The Type-C connector is actually what is utilized to charge the MacBook and Chromebook Pixel.