I've created a Jewish-Celtic (Jewitch) calendar for my blog and am making the calendar and its code (for embedding in websites) available for public use. At some point I may be adding events from Native American timekeeping as well, but I haven't gotten that far yet. It's still under development, but it's "good to go" through February 2007 as of now, with regard to Jewish and Celtic festivals. Shabbat Torah portions are also included as well as candlelighting times. All times are U.S. CST.
It's available on Google calendars under the title "Jewitch Timecraft", if any other Jewitches out there are interested in using it, feel free. No credit necessary.