I
was planning to evaluate devical, but have not tried it yet:
href="http://www.davical.org/" target=_blank
I would welcome comments from anyone with
experience with devical.
DAViCal is excellent. Perhaps more at home on a Debian based disty, but can be installed with 'alien' on CentOS. I think I had to fiddle with some file permissions on CentOS.
It works well, although my brother (who I set it up for) never managed to figure out the calendar permissions.
HTH