Try out the free, downloadable plug-in called CoolIris. It works with your browser to provide a more 3-D viewing experience, or as they put it, "a lightning fast, cinematic way to discover the web."
EarthPhotos.com is compatible with CoolIris. In fact, it works right away, soon as you download the plug-in from the CoolIris site, and it works great. Compare these screen shots. The original, traditional version first, and then the EarthPhotos.com Landscapes Gallery via CoolIris:
There's a discussion of the state of 3-D on the web in 2009 here.
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