Favourites:
http://chicksandbikes.blogspot.com/ - very self explanatory
http://www.cycleexif.com/ - bike porn but not strictly FG
http://fixage.tumblr.com/ - cool pics/drawings...
http://www.milanofixed.com/ - italian + fixeds = win
http://kashimax.blogspot.com/ - kashimax blog
http://pscycle.wordpress.com/ - fixed blog from my hometown - São Paulo/Brazil
http://www.velodeath.com/ - same as above