Media Links:
BBC, CNN, Digg, NYTimes, Rediff, NDTV, Times of India, Newsvine, Yahoo! News

Photographs:
Flickr, Yahoo!, Black Bombay

From the Blogs:

• Bomb blasts in Mumbai’s railway stations
  India Uncut
• Blasts in Bombay: A timeline
  Vantage Point
• Bombay’s rush hour rocked by blasts
  Sepia Mutiny
• Terrorists blow up Bombay trains
  Ultrabrown
• Terrorists strike Mumbai again
  Varnam
• Multiple bombs detonated on Bombay rail system
  Counterterrorism blog
• Bombs in Mumbai!
  Gateway Pundit
• Mumbai Blasts
  Pajamas Media

Update:
Find more information on Mumbai Help, a blog created for information about this horrific attack.
Metroblogging Mumbai has a series of posts and an open thread on the train bomb blasts topic.
Check out the various newspaper front pages on Newsdesigner: Mumbai Bombings, More from India