Dupe Devil for iCal download

Free

iCal - share your events with your friends and see your friend's calendars.

MenuCalendarClock iCal gives you instant access to your iCal calendars from a menu bar icon.

Add-in to iCal that gives the user options for how replies to meeting invites that are sent with Mail are dealt with.

These plug-ins add huge sucking compression, grit, dirt, distortion

Alternative to Apple's iCal birthday calendar that has a range of features that has made it indispensable for many iCal and Address Book users.