Skype for Linux going (almost) open source. The UI will be open, but not the core.
Open source identity: Ruby on Rails creator David Heinemeier Hansson. In this Q&A, he discusses the history of Rails and where it's headed.
5 open source billing systems to watch. AgileBill and others take care of payment processing, invoicing, and more.
Web Open Font Format gets backing from Mozilla. It's an effort to bring advanced typography to the web in a much better way.
Setting up a MySQL cluster for your Linux desktop. It's not so complicated.