You certainly don't want the Transportation Security Authority in your business any more than they have to be, but it turns out having them on your phone isn't all that bad.
Their well-designed new app has real time status updates on major airports including info on delays and wait times for individual security checkpoints, as well as a fun "Can I bring my…" feature where you tap in a word-"shampoo," I tried-and it gives you a full rundown on whether or not you'll be able to bring it on an airplane. Free (My TSA is part of USA.gov's new collection o' apps. Helpful!)
From the app developers: "My TSA" gives you 24/7 access to information that passengers frequently request from the Transportation Security Administration (TSA). "My TSA" provides real-time operating status for U.S. airports from the Federal Aviation Administration (FAA); a tool to find out if an item is allowed in your carry-on or checked baggage; information on ID requirements, liquids rules, and tips for packing and dressing to speed through security.