Right now I'm reviewing the Astronomy chapter for the upcoming 2008 World Almanac—so it was a nice coincidence to run across this link. Haha.nu runs down a list of "The Top Five Virtual Sky Simulators," each of them catering to slightly different levels of interest and expertise.
Need some help making sense of the nighttime sky? Click through and get some fast (and free) electronic assistance.
Top Five Virtual Sky Simulators (Haha.nu)

