Recently, for the london.tlktlk.com website, I modified a wordpress plugin producing an iCal feed of the posts to make it work on the event calendar. Original plugin can be found here.
The modified version takes the events from the database and serves them in an iCal feed which should be compatible with any iCal reader (including Apple’s iCal, Google Calendar et Microsoft Outlook).
You need to have the EC Event Calendar installed. I use version 6.4 - I haven’t tested any other version.
To install: upload in your /plugins directory and activate from the admin.
To download: iCal for EC Event Calendar
* the plugin is downloadable as is - and we endorse no responsability what so ever for its uses and the consequences. Backup your data.