Merge two iCal calendars into one new one
http://www.macosxhints.com/article.php?story=2002092405443213
"Pick a calendar from the list in iCal, then export it to the desktop. Now drag the exported calendar file back into iCal, dropping it on the calendar name you want to merge it with."
Building a Simple Calendar Server with Fedora and WebDAV - FedoraNEWS.ORG
http://fedoranews.org/mediawiki/index.php/Building_a_Simple_Calendar_Server_with_Fedora_and_WebDAV
"In this article I will show you how I've done it, plus I'll show you some other options that you might find interesting if you are a Fedora developer or supporter."
Loominous
http://www.fluffy.co.uk/loominous
"Loominous shows forthcoming events from iCal in your menu bar or in a floating window. Events 'loom', becoming darker and more noticeable as they get closer."