Stellarium
I'll add my vote for this program, I have downloaded and installed most of the free star chart programs plus purchased the two major PalmOS programs, Astromist and Planetarium, plus I bought a Planisphere and have various almanacs etc.. but as a newbie the thing which really helped (and is still helping) me understand the constellations, celestial coordinate systems and to actually locate stars and other objects is Stellarium, I don't know if I'm unique in this but I found 2D star charts hard to relate to the actual sky, Stellarium is such an accurate representation of the 3D sky that it makes it easy to see what you're looking at and this in turn makes it easier to understand 2D star charts.. highly recommended!
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