Recently, the W3 Consortium announced a renewed HTML Working Group effort. Apple has joined this working group, with myself, Hyatt and Adele as our initial representatives. The HTML Working Group has an unusually open process, meaning that anyone can join. If you are part of the WebKit community and interested in helping to define the next generation of HTML, Ian Hickson has instructions for how to join.
Apple is also stepping up our participation in other W3C working groups and other standards bodies related to web technology. If you are interested in helping with any of this work, get in touch and we might be able to get people invited to these other groups.