Image by cubicgarden via FlickrThe news that the head of the BBC’s Internet operations, Ashley Highfield, is stepping down has prompted much speculation about his successor. Highfield is is leaving to launch an on-demand video service for the BBC, ITV and Channel 4 known as Project Kangaroo. The race is now on for one of the most coveted new media jobs in Britain, overseeing a budget of £400 miliion and