Powering Up

When it comes to computer games, the numbers are astounding: the world's top professional gamer has won over half a million dollars shooting virtual monsters on-screen; online games claim literally millions of subscribers; while worldwide spending on computer gaming will top £24 billion by 2011. From techno-toddlers to silver surfers, everyone's playing games on their PCs, Wiis, Xboxes and phones. How are we responding to this onslaught of brain-training, entertaining, potentially addicting, tim