Check out http://phpicalendar.sourceforge.net/nuke/index.php
phpicalendar is a web/php based calendar program that reads .ics files generated by ical. You will have to activate php on your web server if it isn't already. If you don't know how to activate php, check out Marc Liyanage's php install instructions :http://www.entropy.ch/software/macosx/php/#install
This should get you going.