Image via CrunchBaseThis video covers what StatusNet is, its similarities and differences to Twitter, and a bit about its future. There are also great discussions about the advisability of enterprises putting their marketing in Facebook's and Twitter's hands and the growing use of standards like PubSubHubbub, ActivitySrea.ms and WebFinger in other services like Google Buzz. The video is almost twenty minutes long, but it's quite interesting throughout and suitable for both the microblogging veteran and the absolute beginner.
Status.Net is an open-source, federated microblogging platform which runs on about 20,000 sites, the most famous of which is Identi.ca. The service is generally API-compatible with Twitter and Status.Net servers can communicate with each other out of the box, as well as many other social sites like Tumblr and WordPress.com.
Building43.com is a RackSpace-sponsored site which aims to "bring together thought leaders in a variety of disciplines and organizations, from entrepreneurs to those responsible for the latest technologies. They will share knowledge, experiences and advice on how you can use these cool new tools and apps."