Dive Into HTML5: Video on the Web
Mark Pilgrim’s thorough investigation of HTML5’s <video> element provides a huge amount of general background about codecs and containers, plus useful hands-on direction for implementing cross-browser video in a standards-compatible manner, with fallbacks for Internet Explorer. There’s still no single container/codec combination that works for every platform, but Mark’s two-file solution is a good compromise. Contains some fascinating detail on the future of H.264 licensing as well. (via John Gruber)