Bad Astronomy Forums - Forums for discussing astronomy.

LX90 User Group - loads of information, hints and tips.

Universe Today (astronomy news) - excellent astronomy news site.

Astronomy Now Online - homepage of the UK's "Astronomy Now" magazine.

Dark Sky maps - maps detailing light pollution across the globe - very useful for finding true dark sky sites.

Winstars2 - User friendly planetarium software.

Cartes Du Ciel - Excellent planetarium software.

Google Earth - Earth viewer (see my Files section for light pollution overlays).

NASA WorldWind - Similar to Google Earth.

World Wide Telescope - Planetarium program using real sky survey images.

Stellar Magic - Shareware/commercial image processing.

IRIS - Cool freeware image processing utility.

DeepSkyStacker - cool automated image stacking software.

HandyAVI - Can re-orders AVI frames based on image quality.

WcRmac - Firmware hack for Philips Toucam, allows recording in raw mode.

Molekel - Awesome molecular modeller/viewer.

Chemsketch - Drawing chemical reactions made easy.

ArgusLab - Molecular modelling and quantum chemistry software.