Still really digging it. The visual style, the tension, the multitude of charismatic personnel. Add to that a good script with neat little callbacks and you get a very fine movie.
My main criticism concerns the ending. It's cool and super exciting, but also a little too long. In this regard, the film reminds me of Kathryn Bigelow's Strange Days - it just won't end! Climax upon climax, wild plot turns, extended Terminator-esque action sequences - it's as if the movie cranks up to eleven all of a sudden. Which is a pity, given that Collateral is strongest when it needn't hurry.