The Monthly Sky guide
A fantastic site

Society for Popular Astronomy

NASA

Astronomy NowMagazine

An excellent, British magazine.

The Online Planetarium
Pictures from the Hubble Space Telescope

Campaign for Dark Skies

Integuby: video footage of 1999 solar eclipse from Shetland (859K)

 British Astronomical Association

Royal Astronomical Society

Highlands Astronomical Society based near Inverness

Heavens Above Find the ISS and satellites

Shetland Astronomical Society