So far the Unruh effect is only a theoretical curiosity. However, I suspect that the dark energy accelerating our universe is Unruh radiation back from our future event horizon in accord with:
DOES THE UNIVERSE HAVE A DESTINY?
Is feedback from the future guiding the development of life, the universe, and, well, everything? Paul Davies at Arizona State University in Tempe and his colleagues are investigating whether the universe has a destiny—and if so, whether there is a way to detect its eerie influence.
Cosmologists have long been puzzled about why the conditions of our universe—for example, its rate of expansion—provide the ideal breeding ground for galaxies, stars, and planets. If you rolled the dice to create a universe, odds are that you would not get one as handily conducive to life as ours is. Even if you could take life for granted, it’s not clear that 14 billion years is enough time for it to evolve by chance. But if the final state of the universe is set and is reaching back in time to influence the early universe, it could amplify the chances of life’s emergence.
http://discovermagazine.com/2010/apr/01-back-from-the-future/article_view?b_start:int=2&-C=
More precisely, I claim that the observed dark energy density hc/(Hubble distance x Planck length)^4 is direct evidence of our future horizon as the hologram cosmic computer (Seth Lloyd) screen of ~ 10^123 BITs in which we ITs are hologram images back from the future.
The Unruh temperature of a static LNIF at distance Lp from our future horizon is hc/kB(Hubble distance x Planck length)^1/2.
Planck's 1900 law that black body energy density ~ T^4 then gives the correct observed dark energy density. This, admittedly still mysterious result in "The Dread Sarfatti Fog Zone" (Nick Herbert) can hardly be a meaningless chance coincidence. I think it is a profound clue that will revolutionize our conception of the cosmos as did the Copernican paradigm shift did away from the Ptolemaic universe.