I must say it’s something I haven’t been able to understand for a long time now, why isn’t there (Slashdot link)| Quality Open Source Calendaring / Scheduling?
I’ve used Google calendar .. but they’ve have made it way too easy for my liking and MS exchange is a none option for me.
I currently use Webcalendar , which has been fine … but I’m having a slight issue with remote sync to the web calendar through Thunderbird.
So I must look into Zimbra & Citadel who appear to come out the best from this Slashdot forum thread.
Finally a good general read on Creating an Online Event Calendar can be found off the k5n site.