On 12 Feb 2008, at 00:31, Tom Schouteden wrote:
...
However, when I try to add the caldav server in iCal I get this message: "Account information not found.  Request encountered an unexpected error (domain (null) / code 0).".
...
2008-02-11 17:48:45+0100 [-] [caldav-8008]  [HTTPChannel,1,10.0.0.105] "Directory service <SudoDirectoryService 'Test Realm': FilePath('/opt/CalendarServer/conf/sudoers.plist')> has no GUID; generating service GUID from realm name."

I haven't used iCal server myself yet, so please excuse me if this is a dumb suggestion, but this kinda looks like it could be a users / permissions issue. 

Is your data directory, then, on a partition that supports extended attributes?
(see section 2 of <http://lists.macosforge.org/pipermail/calendarserver-users/attachments/20070128/c9dad121/LinuxBuildAndRun-DarwinCalendarServer.obj>)

Stroller.