Is there an intention to support other calendars e.g. Outlook,
MobileMe, Yahoo Calendar, MS Exchange etc. in the Ajax Event Calendar?
Actually you can see the Google Calendar as primary source. You can bind other Calendars, import or sync Outlook Calendars, sync also MobileMe - all to the Google Calendar.
Then you can use that Google Calendar as source for your Ajax Event Calendar. the Ajax Event Calendar binds live to a Google calendar so as soon as an appointment comes in the Google Calendar it is also shown in the Ajax Event Calendar.
Outlook and MS Exchange -> Google Calendar
You can use the Google Calendar Sync tool to synchronize automatically your Outlook or MS Exchange calendar with Google calendar
Yahoo Calendar -> Google Calendar
For Yahoo calendar read this way to sync it with Google Calendar