"Batman Begins"
"Charlie and the Chocolate Factory"
"The Chronicles of Narnia: The Lion, the Witch and the Wardrobe"
"Harry Potter and the Goblet of Fire"
"King Kong"
"Star Wars: Episode III Revenge of the Sith"
"War of the Worlds"
imo, the only real contenders are star wars, king kong, WotW, and narnia. the cg in charlie and the chocolate factory was a joke as far as film goes.
I haven't watched Charlie and Kong, and Narnia, but I'll bet on Kong. There's a rumour he'll exceed Titanic by something... box office sales...or such.