Apparently the prime target for swabbing will be your grubby little hands:

Security experts consulted by CNN said swabbing hands is a good move, and privacy advocates said they support the new swabbing protocols, provided the agency tests only for security-related objects and does not discriminate when it selects people to be tested.

It’s a “very good idea,” said security expert Tony Fainberg. TSA screeners currently swab luggage handles and parts of bags that are likely be contaminated by human hands, he said, and swabbing a person’s hands increases the chances of finding explosive materials. “Looking at the hands means you will probably get a better dose,” he said. - CNN

TSA official presser:

TSA Expands Use of Explosive Trace Detection Technology at Airports Nationwide

Press Release

February 17, 2010

WASHINGTON - The Transportation Security Administration (TSA) announced today that it is expanding the random use of Explosive Trace Detection (ETD) technology at airports nationwide as an additional layer of security.

“Explosive Trace Detection technology is a critical tool in our ability to stay ahead of evolving threats to aviation security,” said TSA Acting Administrator Gale Rossides. “Expanding the use of this technology at checkpoints and at departure gates greatly enhances security to keep the traveling public safe.”

Since the Christmas Day failed attack TSA has increased its random use of ETD technology within security checkpoints to screen passengers’ hands and carry-on luggage. In addition, TSA piloted the use of ETD technology in both the checkpoint queue and boarding areas for two weeks at Raleigh-Durham International Airport, Hartsfield-Jackson Atlanta International Airport, Orlando International Airport, and Pitt-Greenville and Coastal Carolina Regional Airports in North Carolina.

Passengers can now expect to see the increased random use of ETD technology in areas where TSA currently conducts screening such as the security checkpoint, as well as in the checkpoint queue, and boarding areas. Officers may swab a piece of luggage or passengers’ hands, then use ETD technology to test for explosives. The swab is placed inside the ETD unit which analyzes the content for the presence of potential explosive residue. To ensure the health of travelers, screening swabs are disposed of after each use. Since it will be used on a random basis, passengers should not expect to see the same thing at every airport or each time they travel.

To date, the Department has awarded $15 million in American Recovery and Reinvestment Act funding for 400 fixed ETD units. Additionally, President Obama’s fiscal year 2011 budget prioritizes key investments in aviation security, including $39 million to purchase approximately 800 portable ETD machines.