Mailing lists are funneled into news groups. Gmane does spam detection, cross-post handling, has a TMDA-fueled encryption/forwarding service, a web interface, respects X-No-Archive, supplies RSS feeds, uses SPF, features user-defined filters, more...
allows you to create a chat community and talk to people who are currently reading the same web page as you are. Just add gabbly.com/ before the site's url. For example gabbly.com/cnn.com (IE not supported)
Simple site where you are given 1 gb of space to share many things like a simple quote, a picture, or a video. You can keep some things to yourself, share with a small group, or share it with everyone.
a public source code repository that gives you a place to store and organize all the little pieces of code that you use each day. (no version edit, only code publish and tagging)
The six pillars of Wikia's OpenServing offering are: FREE software, FREE bandwidth, FREE storage, FREE computing power, FREE content over the Internet, and GIVING AWAY 100% of the ad inventory and revenue to bloggers and website owners who partner with
a document-driven quasi-wiki product - upload just about any kind of file (office docs, images, whatever) and Versionate will create an editable, wiki-like page with version and access controls