Astronomical resours:

Sternberg Astronomical Institute
Crimean laboratory of SAI
Harward abstract service
The NASA Homepage
Space Research Institute
Astro Space Center
INASAN
Lebedev Physical Institute
Special Astrophysical Observatory

Astronomical journals:

Sky and Telescope
Stargazer

Astronomical Clubs:

ASP List of Amateur Astronomy Clubs

Comet links:

Comet Ephemerides
Comet Observation Home Page
SKY Online's Comet Page
Comet News
CometMan

Others link:

Astronomical info
Astronomical Pictures Database
Astronomical Images Archive
Asteroid
Messier Catalog
Space calendar
NASA Astronomical Pictures
Robotic Telescope