Continuing to clear out old bookmarks: astronomy and astrophysics this time.

Hubble Space Telescope image gallery. For all your astroporn needs.

Notable nearby stars, and NASA's nearby star database. I'd be interested in finding a link to a 3d java visualization of these stars that's less clunky than the "notable" one...

The extrasolar planets encyclopedia. As in, planets orbiting other stars.

Orbits 101. Lots of fun Java simulations of simple orbits, stable solar systems, and systems that appear stable for a while until they become disasterously unstable.

Sedna, Quaoar, and other trans-Neptunian objects. We're only just discovering that there's a lot of stuff out there.