First, Brian Behlendorf, CTO and founder of collab.net, demonstrated the Netbeans.org project. Not only did this effort establish that Sun is committed to supporting the open source movement in many respects, it encourages other vendors and developers to take part and truly create a robust, customized piece of software. This model is obviously alive and well. Additionally, O'Reilly's company is standing behind its president and founder. The API is completely open, and as a result is available in a variety of languages, with more to come.
Open source is about expanding.
It forces good ideas to be used, and as a result those good ideas are expanded upon. The new idea is in turn provided back to the community, and allowed to grow again. Open source is exploding as well. And finally, open source is increasing. As Sun supports open source projects and in turn releases more APIs and products as open source, other companies are doing the same.