Here are some links I feel you may want to check out...                                                                          

Astronomicon             Home of the Astronomicon Webzine
Bell of Lost Souls        Best general Blog for 40k around.
Commissar                 40k site dedicated to all things Imperial Guard
CoolMiniOrNot            The premier miniatures rating site. Go see how much your paint job sucks!
Dakka Dakka              If you consider yourself a “pro 40k” gamer, this site is for you. I also pity you.
Da WAAAGH               40k site dedicated to all things Orks.
Games-Workshop        They’ll probably sue me for having their website linked here or some shit.
Work In Progress         Want to convert your 40k crap? Get your ass over there immediately!