Scifi on the internets

A Colder War by Stross is pretty good, if the name Cthulu means anything to you. (Incidentally, Stross on why space colonisation isn't wildly practical)

(Even more incidentally, Accelerando is available for legal free download)

Also I quite liked this sequence of short stories;

• Passages in the Void
  
• The Passage Home
• Rite of Passage (optional side story, that ain't all that great, imho)
  
• Mortal Passage
  
• Revelation Passage