The folks at HubbleSite.org have a good overview on how to view the magnificent images in WorldWide Telescope.   

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Bring the power of the Hubble Space Telescope to your computer screen, browsing the universe for astronomical phenomena in striking detail. Hubble images in full resolution are now available through Microsoft Research's free WorldWide Telescope (WWT) software. Pan across the constellations to find objects of interest and zoom in for close-ups, or zoom out for context. Hear professional Hubble astronomers explain the stories, science and significance of the objects in guided tours, or make your own tours to share with the public. WorldWide Telescope includes not only Hubble images, but a rich collection of visuals from both ground and space telescopes in visible light, infrared, x-ray, radio and other wavelengths. The universe in its full glory is yours to explore.

HubbleSite - Explore Astronomy - Finding Hubble in the WorldWide Telescope