Evidently, bin Laden has had a chance to visit a barber while he’s been in hiding:

Also yesterday, al Qaeda media arm Al Sahab announced over the Internet that Osama bin Laden will release a video in the days ahead of the sixth anniversary of the September 11 attacks. It would be the first new images of the terror mastermind in nearly three years.
The Department of Homeland Security said it had no credible information warning of an imminent threat to the United States. Still, bin Laden’s appearance would be significant.
The announcement had a still photo from the coming video, showing bin Laden addressing the camera, his beard fully black. In his past videos, bin Laden’s beard was almost entirely gray with dark streaks.

“Al Qaeda media arm?” A terrorist organization with a media arm? That just seems weird. BTW, here’s a useless fact to impress your co-workers with today: Al Sahab means “The Cloud.”