for the freights..    
Visual Oragasm     canada centric, all the good stuff, nice layout and design
Upstate Styles     northeastern graffiti, another very well done site with good content
St. Louis Freights     good and plenty
Rail Kings     hobo graffiti
Connections     some nice freights, no longer updated
Relics of the Rails     same as above
Threat     midwest, also produce a magazine
Sacramento Graffiti     sacramento freights