Latest data
SolarMonitor.org - latest images of the Sun
Lockheed Martin's Space Weather monitor
Spaceweather.com
NOAA's Today's Space Weather
NOAA's list of sites with real-time solar data
Latest plot of X-rays from the Sun
Hinode/SOT Spectropolarimeter data
SOLIS - a new ground-based full disk vector magnetogram
Solar - Terrestrial Physics data at the US NGDC
Latest solar event lists
Lockheed Martin's Active Regions web page
NGDC solar data online

Theory
Hugh Hudson's archive of flare/CME cartoons
Build your own paper model of the Sun, courtesy Canon

Journals/archives
Springer's Solar Physics Online
The Astrophysical Journal Online
Astronomy & Astrophysics Online
arXiv.org
Solar Physics E-Print Archive

Image/movie galleries
Transition Region and Coronal Explorer (TRACE) gallery
Great set of images recently published in the Boston Globe

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