The latest TWiT “Inside the Net” podcast 
deals with online calendar services and the quest for inter-operability.
Guest presenter Scott Mace (Calender Swamp ) talks up Apple’s iCal and Google Calendar which get good marks for working well together (although not always). However,
The biggest problem has been Microsoft Outlook, which I would say most of the world’s calendars are stored in right now. And Outlook has not played well with others.
[Pause the podcast here and get a copy of OMiC which helps Mail.app and iCal play well with Outlook-generated email and calendar data.]
Google Calendar gets Scott’s vote for the most complete solution although his wife (”an Apple bigot”) thinks that iCal is the bees’ knees and she does things with colour in iCal that other calendar apps can only dream about.
The open source calendar app Chandler gets a good rap too, although it is still in beta and has been for a long time.
UPDATE: Hope on the horizon for iCal-Google Calendar synchronisation.
Mark Scrimshire has written two plugins for Address Book that automatically add information about a particular contact into a Google Calendar event.
Google has expanded and renamed its 
Chip Cuccio’s distraction-free WebKit browser for Google Calendar has been updated.
Inspired partly by Michael McCracken’s distraction-free, dedicated 
Martin Gordon 
The poser at Smallwire is a good geek. 
