Poisoned loot

Be careful what free tunes you download via P2P programs such as Kazaa - the latest anti-pirate tactic by record companies seems to go beyond the planting of just passive dummy files.

Now the music giants appear to have seeded the networks with "songs" that spawn pop-up windows loaded with adware. So far, the technology is confined to Windows Media Audio (WMA) files and it's hardly what you'd call destructive but, at a guess, it's a sign the "war" on downloading is going to get dirty.