MSM: Shorthand for Mainstream Media. Usually used a a pejorative by people who get their news from other sources (bloggers, talk radio, etc.) From Wikipedia: "The mass-media audience has been viewed by some commentators as forming a mass society with special characteristics, notably atomization or lack of social connections, which render it especially susceptible to the influence of modern mass-media techniques such as advertising and propaganda. It is also gaining popularity in the blogosphere when referring to the mainstream media (MSM)."

NAMBLA: North American Man-Boy Love Association. A small group of profoundly creepy men who postulate that they have a right and obligation to have sex with pre-pubescent boys. Wiki link.

GLAAD: Gay and Lesbian Alliance Against Defamation. Very similar to the other anti-defamation groups out there. Wiki link.