Astronomy Cast: My favorite astronomy podcast
Universe Today: News about astronomy
SkyView: A virtual internet telescope
Stellarium: Free planetarium software
Regular introductory courses held by Prof. Richard W. Pogge at
the Ohio State University,
recorded as a podcast with course notes available as HTML. Also
about "Life in the Universe".
arXiv.org: Scientific papers which
are published here are freely downloadable without subscription. In
astronomy, a lot of papers get published here (subject class astro-ph
under the "physics" section)
Operate fully remote-controlled high-end amateur telescopes
online at itelescope.net/.