A few months back, David talked about ways to pass through airport security without unpacking your laptop. The upshot: You need a checkpoint-friendly bag. The above CNET video, Get Through Airport Security Quickly, touches on that subject, but also points you to helpful sites like FlightStats (to see if your flight's been delayed) and Security Checkpoint Wait Times (for an estimate of how long you'll be standing in line).
I won't spoil the rest of the video's "surprises," but suffice it to say, if you want to zip through security as quickly as possible, it's worth watching. Any checkpoint-savvy tips of your own to share? You know where: the Comments!