Linked by Thom Holwerda on Thu 10th Jan 2013 23:20 UTC
"Recently, a method was found for Windows RT that allowed running unsigned code through a rather clever exploit. This method has now been turned into a full fledged tool by XDA Developers member Netham45. All the details are over in this XDA post, including the download." Super-simple, even a child can do it. A big <3 to XDA.