For years, using more elegant techniques involving transgenic light-sensitive ion channels, scientists have been able to influence or even control mouse and zebrafish behavior.
Photolytic uncaging, the technology used in this paper, has been around for almost 30 years and is currently employed by hundreds of neuroscience labs, mostly in mice. A quick pubmed search will confirm this.
I am always baffled by the random media sensationalization of neuroscience articles that are not even remotely innovative. I'm not blaming you, Chad, because I saw this on the front page of Yahoo also.
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Aravanis A, Wang LP, Zhang F, Meltzer L, Mogri M, Schneider MB, Deisseroth K. An optical neural interface: in vivo control of rodent motor cortex with integrated fiberoptic and optogenetic technology. J. Neural Eng. 2007 Sept; 4:S143-S156.
Arenkiel BR, Peca J, Davison IG, Feliciano C, Deisseroth K, Augustine GJ, Ehlers MD, Feng G. In vivo light-induced activation of neural circuitry in transgenic mice expressing channelrhodopsin-2. Neuron. 2007 Apr 19;54(2):205-18. [ PDF ]