Pirates of the Caribbean: Dead Man's Chest
U.S. Marshals
Blade II
Plus if we're not just talking 2nd movies, but also 3rd, 4th, 5th, 21st...
Casino Royale (though it's a prequel)
Batman Begins (also a prequel)
Live Free or Die Hard
Lethal Weapon 4
Everything else that comes to mind has been mentioned already; Empire Strikes Back and T2 remain the best examples.