Comic Book News Sites:

Comic Book Resources
Newsarama
Comic Vine
iFanboy

Major Comic Book Publishers:

DC Comics
DC Comics Blog
DC Comics out this week

Marvel Comics
Marvel Comics News/Blog
Marvel Comics out this week

Dynamite Entertainment
Dynamite Comics out this week

Image Comics
Image Comics News
Image Comics Blog
Image Comics out this week

Dark Horse Comics
Dark Horse Comics Blog
Dark Horse Comics out this week

Top Cow Productions

IDW Publishing

Publishing Dates and Statistics:

Comic List – What’s coming out this week or months down the road, covers both major and minor publishers
The Comics Chronicles – Sales stats by month

Great Comic Book Podcasts:

Comic Vine Podcast
Comic Book Noise
Fanboy Buzz Podcast
Comic Book Page Podcast
The Comics Podcast Network - Lists many different comic book podcasts

Comic Book Forums:

Comic Vine Forum – Fantastically huge, covering characters, writers and illustrators, etc. Possibly the best discussion forum out there
Comic Book Resources Forum – An excellent, large forum
Comic Bloc Forums – Wonderfully extensive
Comic Book Page Forum – A good general discussion forum
Comic Book Plus Forum – Golden and Silver Age Comics Forum