It's been over 13 years since we did a Q&A with Linux International executive director Jon "maddog" Hall. For decades, maddog has been one of the highest profile advocates for free and open source software. He is currently working on Project Caua which aims "to promote more efficient computing following the thin client/server model, while creating up to two million privately-funded high-tech jobs in Brazil, and another three to four million in the rest of Latin America." He's also gearing up for FISL in Brazil, and helping to plan the FOSS part of Campus Party Europe in London. maddog has graciously agreed to find time to answer some of your questions. As usual, ask as many as you'd like, but please, one question per post.