-- Free downloads of planetarium programs (I haven't tried any of these ten programs).
-- Heavens Above All the information you need to observe satellites such as the International Space Station, Starshine 2 and 3, Hubble Space Telescope, the Space Shuttle, spectacular events such as the dazzlingly bright flares from Iridium satellites as well as a wealth of other space flight and astronomical information.
-- And, as if that wasn't enough, here's Bill Arnett's
huge
compedium of
planetarium programs and his Nine
Planets tour.