Right, like there was any way I wasn't going to link to this. Over on Entertainment Weekly's site, Darren Franich has written an incredibly thorough and insightful article on one of my favorite films, Collateral.
Collateral is all of Michael Mann's movies in one—even The Keep. And more: Collateral is a high point in the career of basically everyone involved. It's the last Tom Cruise film from the pre-Katie Holmes era—the epitome of Cruise in his unquestioned superstardom, before the couch-jumping Weird Period and the post-couch re-entrenchment in his PG-13 Action-Movie Fortress of Solitude. It's the last film Jamie Foxx made before Ray turned him into Oscar Winner Jamie Foxx and then Hit Musician Jamie Foxx and then Frustrating Actor Jamie Foxx.
Everything you could possibly want or need to know about Collateral is in this article. Set aside a good chunk of time and read it now.