Anthony Ayiomamitis' Astronomy Humor.
Astronomy Humor by Eric Jamison
Joachim Verhagen humor website has a large science section and a subsection on astronomy humor.
Fun and Facts related to Astronomy at one place.
Part of Kids Astronomy website
All the space news that there's space to fit news in
Part of a larger website of science humor
From the self proclaimed "slightly warped mind" of Gary Greenburg
by Andy Blackburn. Includes: Astronomy Bloopers and You Know You are a Redneck Astronomer if ...
"A weekly podcast about a recent news item in astronomy done by gen-xy astronomers. We try to be irreverent and humorous and occasionally we get the facts straight."
This site is "devoted to airing out myths and misconceptions in astronomy and related topics." Not a humor site, but written with humor by Phil Plait.