I don't think it's hyperbole to say that the next four years will present one of the greatest challenges to the Secret Service protecting President-Elect Obama and his family, so it isn't a surprise that the Secret Service may be deploying some super high tech next-gen weaponry and counter measures.
Presidential protection is likely to include a range of jammers to stop remote bomb detonation, and possibly remote-controlled aircraft attacks. With all this jamming, interference can occur and make radio communication impossible – if you leave any frequency clear, the bad guys might use it to send a detonation signal. So perhaps the Secret Service may have a microwave voice transmission system as an emergency backup when radio communication is impossible. This would allow them to beam instructions to agents at a distance. At a pinch it could also be used to distract a would-be assassin --- having a voice suddenly booming inside your head should put off most snipers (…though they might have a few voices in there already).We know that the Air Force have looked at microwave sound as a nonlethal weapon, and long-range acoustic systems like LRAD are already in use by the military and others. So a Secret Service microwave sound system is not totally, completely out of the question.
And of course the Secret Service also have at their disposal...sharks with FREAKIN' LASER BEAMS on their FREAKIN' heads.
Update: New York Times has more on the overall ramping up of security around Obama and his family after November 4th.
Although he does not yet have access to Air Force One, he now rides in an armored government limousine, complete with the war wagon and other motorcade vehicles zipping through red lights with traffic blocked. Although the Secret Service long ago set up concrete barriers around his house here, they expanded their perimeter by several blocks after the election and brought in explosive-sniffing dogs.
“It’s changed,” said Mesha Caudle, 45, who lives a block from the Obamas. “It’s a little inconvenient, just a little, when you have to go around three blocks to go one block. I don’t mind, though, because I got the president I voted for. If the price is a little inconvenience, that’s O.K.”