Guardian Unlimited | Guardian daily comment | The more principle

The set features an interactive multi-angle scene study, a "making-of" documentary, rehearsal footage of the fight between Wolverine and Deathstrike, a gallery of stills and 11 extended or deleted scenes.

Economists call this sort of stuff add-on value: the bigger the blockbuster, the more footage of ancillary blah can be unloaded on deluded obsessives at negligible cost to the studios but at a healthy return in DVDs.