A truly wonderful resource for Sci-Fi gaming, especially using the excellent X-Plorers RPG, is the EXONAUTS! blog. I especially liked the Random Space Finds entries and the recent Galactic Outfitters Sale on Megafauna Wetwire Packages post. That was priceless!
Another excellent Resource-Style blog that I recently discovered during a bit of surfage is Threads of Adventure, which caught my eye with the 50+ Ways To Die In A Cave post. There are a blue million resources (give or take a few), ideas and other stuff to keep you busy once you start reading this blog, so better plan to set a little time aside to really dig into it all. And the author is another fellow fan of Archaeology Magazine. Very cool. Very worthwhile.
Telecanter's Receding Rules is still one of my Top Five OSR Blogs to read, mostly because Telecanter almost always manages to locate a bunch of resources, images or other stuff that dove-tail beautifully with some of my on-going projects, but they're usually something other than what I already have on-hand, so it's amazingly useful, inspiring and a lot of fun to see what all else they post. The recent Public Domain Images post is a very good companion-piece to my own previous Public Domain References post, they're like book-ends after a fashion.