Inov8 are the main sponsors and there are chances to win entry into the Sheffield Urban event in September. A description from the website:
SYO website wrote:A high intensity, high speed form of orienteering, the Ultrasprint starts and finishes into a specially constructed labyrinth. Competitors face a technical and physical challenge that includes complex map reading, multi-terrain racing, and a number of river crossings. A number of the UK's top elite orienteers will battle it out over a qualifying stage and final to become the Ultrasprint champion 2011.
If the previous Ultrasprint's are anything to go by, I'm looking forward to it

More info here.