I have used of this developer's other calendar utilities AquilaCalendar, then AquilaCalendarMB and then AquilaCalendar when he discontinued AquilaCalendarMB.

BdCalendar is at version 1.03 at their web site.

BdCalendar has access to your Apple's Address Book and iCal as well provide calendar views in 1, 3, 6 or 12 month formats.

As NorbyWells says The developer's support and response is exceptional. He responded to a question I had about BdCalendar within minutes of me sending an e-mail. He responded to me in a matter of minutes also answering my question.

I very highly recommend BdCalendar to any Leopard user