One thing I miss from Outlook and Entourage is the ability to link files to iCal events. I can set an alarm to open a file at a certain time, but sometimes I just want to have all the files associated with an event handy. I just noticed that one can link files to iCal events by using the file:// prefix in the URL field. Not ideal, but for now, that will have to do.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20051209165439536