Calendar is in our roadmap to the next release. So please be patient. :) It wasn't included from the beginning because of necessity of some refactoring work.
Thanks so much for the link. I have a question: is it easy to change the jenia4faces skin to ajax4jsf skin? (I never look at the code of any JSF component, so I don't know its difficulty level).
I'm looking for a calendar component that can have selectable dates filtered (and displayed differently). Do you plan to have this feature in your upcoming component ?
Look here for a dhtml component with such a feature: