I've also seen some interesting rants about racial subtext with the rather regrettable wigs they use for Teyla on the show (for comparison, her gorgeous natural hair looks more like this (http://i48.photobucket.com/albums/f203/DebraDownSth/OtherActors/RachelLuttrellWOSF.jpg), but they're all f-locked.
Not SGA-specific, but there's tons and tons of interesting stuff you might like browsing through in past issues of the POC in SF Carnival (http://ofcolour.blogspot.com/) -- Carnival 6 is up at deadbrowalking, the blogspot link there has links to earlier issues. (Less fandom-specific, although it's still heavy on fannish stuff, there's also tons and tons of interesting material if you go through the ibarw archives.
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Not SGA-specific, but there's tons and tons of interesting stuff you might like browsing through in past issues of the POC in SF Carnival (http://ofcolour.blogspot.com/) -- Carnival 6 is up at