Michael Bay has taken the video format wars to a new level when he briefly threatened to pull out of a Transformers sequel after it was announced that it would be available only on HD-DVD. He later recanted, but it inspired an article on the BBC that looks at the state of the war. In North America, HD-DVD is the top selling player, but more Blu-ray players are actually in homes thanks to the Playstation 3.

Prices of players on both sides have dropped recently - with dedicated HD-DVD players outselling Blu-ray in the US.

However, the fact that Sony's PlayStation 3 games console can play Blu-ray discs means more homes have Blu-ray players.

It is believed that Hollywood studios could ultimately decide the fate of the two formats, but the fact that Sony is itself a movie studio has complicated the matter.

Read more here.