"Dive Into Python 3 covers Python 3 and its differences from Python 2. Compared to Dive Into Python, it’s about 20% revised and 80% new material. I am publishing drafts online as I go. Please send feedback. The final version will be published on paper by Apress. The book will remain online under the CC-BY-SA-3.0 license."
Mark Pilgrim's perspective on proprietary formats, digital rights management and data preservation or why should I avoid Apple computers.