Web 2.0
Based on the audience and speakers at the Web 2.0 conference recently, evidently the people left out of the Web 2.0 phenomenon are non-white people and and women. I didn't attend the conference, though I do fit into both the male and white categories. So maybe eternally single white dudes are another group excluded from the benefits of Web 2.0? (I've been Web 2.0 for five years and it still hasn't gotten me laid.) Who else feels excluded from Web 2.0?