Long-time readers of the blog will know that I am a Grognard (J.G.) of the Traveller Universe. (Ask me for my IMTU code sometime). There are a number of blogs out there dedicated to Traveller or Traveller-esque resources. Sound off!:
The Zhodani Base: Musings on various aspects of Traveller canon, and a new addition to the RPG Bloggers Network. Welcome!
CotI Blogs: Citizens of the Imperium does allow members of their Imperial Moot to have blogs. Most are rarely updated, but that doesn't mean there aren't some interesting tidbits here and there.
My Own Private Universe: Universe-building, using the Classic Traveller rules.
IMTU: Rarely updated, but has some interesting visual resources.
Traveller Map: Stay updated on the news regarding the amazing Traveller Map.
Stellar Reaches: A fanzine for Traveller. Updates in blog format.
You'll note a lot of these blogs aren't updated as much as one might like. This is strange, considering Traveller has one of the most robust online communities of any game title/series. But it could be that the Traveller fandom is more forum and mailing list-oriented, just as some fanbases are more at home on blogs or somesuch.