Digital clanking

When you hear all those clanking cowbells as Olympic ski-ers swerve to a halt at the end of their donwhill/slalom/jump etc, it's possible that the posh people in the watching crowd may not actually have real bells. They may be just shaking their iPhones, with a 99cent app called Cowbell2010. More than 12,000 downloards already. From the WSJ.