Since HTML5 is a large specification Ian and I, being encouraged by Dan Connolly from the W3C, wrote an introductory document to the offline Web application features in HTML5 — Offline Web Applications — which the W3C published earlier today. In summarized form, it explains the SQL API, the offline application cache API, and some of the related APIs, such as online and offline events.
Moments ago the joint effort of the W3C HTML WG and WHATWG resulted in publication of two documents in the W3C Technical Report space: HTML 5 and HTML 5 differences from HTML 4. I think I can safely say that the WHATWG community is very happy with the W3C publishing HTML 5 as a First Public Working Draft. Many thanks to all involved!
The W3C is having its technical plenary day today, and a number of WHATWG contributors are there. It's hard to participate remotely in this event, but you can watch and listen — the W3C is publishing an audio stream (in Ogg; a Java applet alternative is available too), and has commissioned realtime captioning for the event. There's also W3C IRC channel on the topic on irc.w3.org, port 6665, channel #tp, password (no password anymore). You can also chat with WHATWG contributors who are present at the event on our own IRC channel.beantown * (a single asterisk) (it's not clear why there's a password, just go with it)
The agenda for the day is available from the W3C site. Don't forget to adjust the times from the Boston timezone to your timezone if you want to listen to a particular session.