The Newyorker
Air and Space
The Armchair Scientist
Ascending Node (This one is for Space Exporation.)
CCD Astronomy (re: CCD imaging cameras and backyard astronomy)
Chemical & Engineering News
Chemical Week
National Science & Technology Week (NSF)
Nature
New Scientist
Omni
Popular Mechanics
Popular Science
Science
Scientific American
Sky & Telescope
Skywatch
Technology Review
UniScience News (university research)
Life
Smithsonian
Time
BYTE
MAD