List broken into categories: Getting Started, Usefulness, Social Libraries, Communication, Data, Online Learning, Specific Tools, Collaboration & Distribution, Improving Appeal & Service, Staff, and General - from College@Home.
The American Physical Society represents some 45,000 physicists, and most of our work centers on scientific meetings and publications-the primary ways that physicists communicate with each other. With PhysicsCentral, we communicate the excitement and importance of physics to everyone. We invite you to visit our site every week to find out how physics is part of your world. We'll answer your questions on how things work and keep you informed with daily updates on physics in the news. We'll describe the latest research and the people who are doing it and, if you want more, where to go on the web. So stick with us. It's a big, interesting world out there, and we look forward to showing you around.
BuddyPress.org
Social networking in a box. Build a social network for your company, school, sports team or niche community all based on the power and flexibility of WordPress.
ccMixter is a community music site featuring remixes licensed under Creative Commons where you can listen to, sample, mash-up, or interact with music in whatever way you want.