AllForums - http://www.allforums.net/
A discussion forum centered around politics, religion, science, and philosophy.
Notebook Forums - http://www.notebookforums.com/
Notebook forums is where you can read the latest notebook reviews from unbiased members of the community who just want to share their experiences with their system. Prices, tech help, and general discussion also can be found.
Tilted Forum Project (TFP) - http://www.tfproject.org/
A discussion community that combines themes of progressive sexuality and universal acceptance.