From the spookiness of "Signs" to the old-fashioned wizardry of "The Lord of the Rings," the long-lasting trend is clear. Comedy and action still draw crowds, but fantasy is the genre of choice for filmmakers and audiences who want to tap into cinema's most imaginative possibilities. At one end of the spectrum are sword-and-sorcery sagas set in exotic places. At the other end are science-fiction stories, which are more grounded in reality, but use their futuristic technologies as perfunctory backdrops for magical adventures. Some pundits think the wave of fantasy filmmaking will subside, especially if war movies continue to grow...