Lasers & Holography

Lene Hau and her colleagues at the Rowland Institute for Science have done just that with a clump of supercooled atoms and a laser.

Two years ago we slowed it [light] down to 38 miles an hour; now we've been able to park it then bring it back up to full speed.

From the Harvard press release:

Hau and her co-authors, Naomi S. Ginsberg and Sean R. Garner, found that the light pulse can be revived, and its information transferred between the two clouds of sodium atoms, by converting the original optical pulse into a traveling matter wave which is an exact matter copy of the original pulse, traveling at a leisurely 200 meters per hour. The matter pulse is readily converted back into light when it enters the second of the supercooled clouds -- known as Bose-Einstein condensates -- and is illuminated with a control laser.

And for good measure, here's a link to their paper which was recently published in nature.