I recently read an article at the Washington Post that was absolutely fascinating! It discusses methods that researchers have used recently to slow light waves.
"Even the best fiber-optical systems today rely on intervening electrical signal processors, because no one has figured out a practical means of putting the brakes on light at critical junctions."
"Once the slowed light exits, it naturally resumes it normal velocity -- 300 million meters per second, or fast enough to circle the Earth seven times in one second."
It is a long article, but extremely interesting. Check it out here.
Thanks to Jeff Nolan for the find!