Fox Searchlight is using a blog to aggregate and monitor news and info regarding the release and success of Danny Boyle's "28 Days Later". In addition, this Friday the ending of "28 Days Later" will be updated (from NYTimes):

The current ending — fairly upbeat given what has come before — will still be there. It will now be followed, however, by a four-minute sequence, beginning with the on-screen words "But what if," during which a darker, more desperate conclusion unfolds.

Alternative endings — like deleted scenes, "making of" featurettes and directors' commentary — have become a staple of the DVD market. But adding such extras while a film is still in theaters is virtually unprecedented. The decision of Fox Searchlight, the movie's producer and United States distributor, to add the extra scenes to the theatrical version reflects the impact of technologies like DVD and the Internet on the culture of moviegoing.