What you are seeing here—in an official photo from the White House—is a close-up of the President's desk in the Oval Office. And that thing on top is, yes, you know exactly what it is.
Yeah, it is a manila envelope. It was left for President Barack Obama by Former President George W. and God only knows what is inside. I like to believe is a MacBook Air with all the secret files from Area 51 and a secret alternative cut of the Zapruder film, showing three snipers killing JFK.
Or maybe it's just directions to W's secret stash of salty crackers written with crayon on the back of an old Dick Cheney's memo titled: "Yes George, there were no WMDs in Iraq." [Boston.com]