Feel free to edit this and add any ones you come across!
See the WordPress.org Showcase at http://wordpress.org/showcase.
See the WordPress.org Showcase College tag, found at: http://wordpress.org/showcase/tag/college/
See this section of the Showcase: http://wordpress.org/showcase/tag/news/
See these two Showcase tags:
http://wordpress.org/showcase/tag/celebrities/ http://wordpress.org/showcase/tag/entertainment/
See this section in the Showcase: http://wordpress.org/showcase/tag/culture/
See this section in the Showcase: http://wordpress.org/showcase/tag/politics/