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Astronomy Data
Solar monitor
Hinode/Solar-B Mission

Reading
NASA ADS, Japanese mirror
astro-ph

Writing
the Comprehensive TeX Archive Network
LaTeX manual on WikiBooks
An exhaustive table of LaTeX math symbols

Science
The Physics Factbook, the perfect place for finding the {blank}est {blank} of the physics world

Weather and Webcams
Montana:
Joe Shaw's Weather Station
MSU webcam
Hawaii:
Surf News Network
Mauna Kea Weather Center
New Mexico:
NOAA Weather for Sunspot, NM
Village of Cloudcroft, NM webcam