I noticed that several people had remarked that the chip got warm in use, so I decided to run a quick test.
I set up the wall wart on my power meter and plugged in the Riot Board to see what current it drew.
When first plugged in, the wall wart drew between 30 to 40 milliamps at 110VAC.
The power consumption was about 1.1 watts.
After a few minutes, the draw eased to about 20 milliamps and the wattage dropped to about 1.0 watts.
I did notice a slight increase in the chip temperature, but I did not run it very long.
When I get around to putting the whole system together, I will take some additional power readings once it is in operation.