The BBC broadcast a half hour documentary on Saturday called 'Guns, Girls and Games' which deals with sexual harassment in video games.
http://www.bbc.co.uk/programmes/p00s9jly
Two of the women interviewed in the programme run websites which try to highlight harassment and misogyny in online games:
http://fatuglyorslutty.com/ http://www.notinthekitchenanymore.com/
They also briefly discussed the homophobia and racism present in some gaming communities.
Incidentally, Xbox Live's response to homophobia is a perfect example of how to not solve these kinds of problems. They simply made it so users couldn't express their sexual orientation on their profiles. 'Cos, you know, the best way to make gay users feel like comfortable and welcome members of a community is to force them back in the closet for their own protection…
-- Tom Morris http://tommorris.org/