Do's and don'ts of adaptation: The Seattle Times offers six rules for turning a comic book into a film:

"Don't buy the rights to a title just to change what made it popular. Last year's disastrous League of Extraordinary Gentlemen (DC) is the greatest recent case study. The jury's out on Constantine, based on DC's long-running Hellblazer series about a blond English rogue of an occult investigator. Due in February, the film has been moved from the U.K. to Los Angeles and stars dark-haired Keanu Reeves."