The TSA has been experimenting with a new system called the TSA Pre✓, which allows trusted travelers to skip some of the annoyances of the TSA security process. Until now, the program had been limited to frequent flyers on Alaska Airline, Delta, and American Airlines, but the program will soon be expanding to travelers on United flying out of Chicago O'Hare (ORD) and Newark Liberty International (EWR).
Currently, the system is opt-in and limited to travelers who are frequent travelers or already members of a pre-screening travel program, such as NEXUS, Global Entry, or SENTRI. Once enrolled and screened, you gain access to a faster line where your shoes can remain on, your laptop can remain in the case, and you can keep your belt on while moving through security.
If you're interested in signing up, there's more information available on the TSA website or you if you are flying United, you can always try to sign up with the link that they sent me. Signing up does not guarentee acceptance into the program.