Smart phones, iPods, and USB memory sticks are posing <A HREF="http://news.bbc.co.uk/1/hi/technology/4946512.stm">a real risk for businesses,</A> warn security experts. Just over half of companies take no steps to secure data held on these devices, found a UK government-backed security survey. Now security firms are developing ways to help firms control access to the confidential data held on the gadgets. They are also working on ways to stop the devices being used by viruses as a way to bypass other digital defenses.