I couldn't find such a list anywhere so I wanted to create a resource for people to post android devices that can run USB DAC. So far, I was able to get Nexus 7 tablet to run my Practical Devices XM6, and a cheap-o USB audio plug-and-play device. To do this, I had to:
Buy an OTG USB cable
Root and unlock the device
You have to restart the device with the OTG cable and the DAC hooked up to the nexus in order for sound to route through the DAC.