This is a simple app that presents the salesforce Campaign objects in a month-calendar layout. It uses jquery and fullcalendar for the presentation and a simple class to convert the data into json.
If you don't need to modify it, you can install it from here for free: http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003Io4WEAS
Build status:
Copyright 2011, James Sullivan, Cambridge Cloud Partners, Inc.
Jquery, fullcalendar, and other portions under other licenses.
The overall package is released under the GPL license: http://www.gnu.org/licenses/gpl.html